update test cases to new panic API

test/cases/compile_errors/panic_has_source_location.zig

@@ -6,7 +6,10 @@ export fn foo() void {
     @panic("oh no");
 }
 
-pub fn panic(_: []const u8, _: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, ert: ?*std.builtin.StackTrace, ra: ?usize) noreturn {
+    _ = cause;
+    _ = ert;
+    _ = ra;
     @compileError("panic");
 }
 
@@ -14,4 +17,4 @@ pub fn panic(_: []const u8, _: ?*std.builtin.StackTrace, _: ?usize) noreturn {
 // backend=stage2
 // target=native
 //
-// :10:5: error: panic
+// :13:5: error: panic

test/cases/safety/@alignCast misaligned.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "incorrect alignment")) {
+    if (cause == .incorrect_alignment) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/@enumFromInt - no matching tag value.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "invalid enum value")) {
+    if (cause == .invalid_enum_value) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/@errorCast error not present in destination.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "invalid error code")) {
+    if (cause == .invalid_error_code) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/@errorCast error union casted to disjoint set.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "invalid error code")) {
+    if (cause == .invalid_error_code) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/@intCast to u0.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer cast truncated bits")) {
+    if (cause == .cast_truncated_data) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/@intFromFloat cannot fit - negative out of range.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer part of floating point value out of bounds")) {
+    if (cause == .integer_part_out_of_bounds) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/@intFromFloat cannot fit - negative to unsigned.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer part of floating point value out of bounds")) {
+    if (cause == .integer_part_out_of_bounds) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/@intFromFloat cannot fit - positive out of range.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer part of floating point value out of bounds")) {
+    if (cause == .integer_part_out_of_bounds) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/@ptrFromInt address zero to non-optional byte-aligned pointer.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "cast causes pointer to be null")) {
+    if (cause == .cast_to_null) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/@ptrFromInt address zero to non-optional pointer.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "cast causes pointer to be null")) {
+    if (cause == .cast_to_null) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/@ptrFromInt with misaligned address.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "incorrect alignment")) {
+    if (cause == .incorrect_alignment) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/@tagName on corrupted enum value.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "invalid enum value")) {
+    if (cause == .invalid_enum_value) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/@tagName on corrupted union value.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "invalid enum value")) {
+    if (cause == .invalid_enum_value) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/array slice sentinel mismatch vector.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "sentinel mismatch: expected { 0, 0 }, found { 4, 4 }")) {
+    if (cause == .sentinel_mismatch_other) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/array slice sentinel mismatch.zig

@@ -1,9 +1,14 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "sentinel mismatch: expected 0, found 4")) {
-        std.process.exit(0);
+    switch (cause) {
+        .sentinel_mismatch_usize => |info| {
+            if (info.expected == 0 and info.found == 4) {
+                std.process.exit(0);
+            }
+        },
+        else => {},
     }
     std.process.exit(1);
 }

test/cases/safety/bad union field access.zig

@@ -1,9 +1,16 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "access of union field 'float' while field 'int' is active")) {
-        std.process.exit(0);
+    switch (cause) {
+        .inactive_union_field => |info| {
+            if (std.mem.eql(u8, info.active, "int") and
+                std.mem.eql(u8, info.accessed, "float"))
+            {
+                std.process.exit(0);
+            }
+        },
+        else => {},
     }
     std.process.exit(1);
 }

test/cases/safety/calling panic.zig

@@ -1,9 +1,14 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "oh no")) {
-        std.process.exit(0);
+    switch (cause) {
+        .explicit_call => |message| {
+            if (std.mem.eql(u8, message, "oh no")) {
+                std.process.exit(0);
+            }
+        },
+        else => {},
     }
     std.process.exit(1);
 }

test/cases/safety/cast []u8 to bigger slice of wrong size.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "exact division produced remainder")) {
+    if (cause == .exact_division_remainder) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/cast integer to global error and no code matches.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "invalid error code")) {
+    if (cause == .invalid_error_code) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/empty slice with sentinel out of bounds.zig

@@ -1,9 +1,14 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "index out of bounds: index 1, len 0")) {
-        std.process.exit(0);
+    switch (cause) {
+        .index_out_of_bounds => |info| {
+            if (info.index == 1 and info.len == 0) {
+                std.process.exit(0);
+            }
+        },
+        else => {},
     }
     std.process.exit(1);
 }

test/cases/safety/exact division failure - vectors.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "exact division produced remainder")) {
+    if (cause == .exact_division_remainder) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/exact division failure.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "exact division produced remainder")) {
+    if (cause == .exact_division_remainder) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/for_len_mismatch.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "for loop over objects with non-equal lengths")) {
+    if (cause == .for_len_mismatch) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/for_len_mismatch_three.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "for loop over objects with non-equal lengths")) {
+    if (cause == .for_len_mismatch) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/ignored expression integer overflow.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer overflow")) {
+    if (cause == .integer_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/integer addition overflow.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer overflow")) {
+    if (cause == .integer_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/integer division by zero - vectors.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "division by zero")) {
+    if (cause == .divide_by_zero) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/integer division by zero.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "division by zero")) {
+    if (cause == .divide_by_zero) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/integer multiplication overflow.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer overflow")) {
+    if (cause == .integer_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/integer negation overflow.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer overflow")) {
+    if (cause == .integer_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/integer subtraction overflow.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer overflow")) {
+    if (cause == .integer_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/memcpy_alias.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "@memcpy arguments alias")) {
+    if (cause == .memcpy_alias) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/memcpy_len_mismatch.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "@memcpy arguments have non-equal lengths")) {
+    if (cause == .memcpy_len_mismatch) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/memset_array_undefined_bytes.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer overflow")) {
+    if (cause == .integer_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/memset_array_undefined_large.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer overflow")) {
+    if (cause == .integer_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/memset_slice_undefined_bytes.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer overflow")) {
+    if (cause == .integer_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/memset_slice_undefined_large.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer overflow")) {
+    if (cause == .integer_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/modrem by zero.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "division by zero")) {
+    if (cause == .divide_by_zero) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/modulus by zero.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "division by zero")) {
+    if (cause == .divide_by_zero) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/noreturn returned.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "'noreturn' function returned")) {
+    if (cause == .noreturn_returned) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/optional unwrap operator on C pointer.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "attempt to use null value")) {
+    if (cause == .unwrap_null) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/optional unwrap operator on null pointer.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "attempt to use null value")) {
+    if (cause == .unwrap_null) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/out of bounds array slice by length.zig

@@ -1,9 +1,14 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "index out of bounds: index 16, len 5")) {
-        std.process.exit(0);
+    switch (cause) {
+        .index_out_of_bounds => |info| {
+            if (info.index == 16 and info.len == 5) {
+                std.process.exit(0);
+            }
+        },
+        else => {},
     }
     std.process.exit(1);
 }

test/cases/safety/out of bounds slice access.zig

@@ -1,9 +1,14 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "index out of bounds: index 4, len 4")) {
-        std.process.exit(0);
+    switch (cause) {
+        .index_out_of_bounds => |info| {
+            if (info.index == 4 and info.len == 4) {
+                std.process.exit(0);
+            }
+        },
+        else => {},
     }
     std.process.exit(1);
 }

test/cases/safety/pointer casting null to non-optional pointer.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "cast causes pointer to be null")) {
+    if (cause == .cast_to_null) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/pointer casting to null function pointer.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "cast causes pointer to be null")) {
+    if (cause == .cast_to_null) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/pointer slice sentinel mismatch.zig

@@ -1,9 +1,14 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "sentinel mismatch: expected 0, found 4")) {
-        std.process.exit(0);
+    switch (cause) {
+        .sentinel_mismatch_usize => |info| {
+            if (info.expected == 0 and info.found == 4) {
+                std.process.exit(0);
+            }
+        },
+        else => {},
     }
     std.process.exit(1);
 }

test/cases/safety/remainder division by zero.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "division by zero")) {
+    if (cause == .divide_by_zero) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/shift left by huge amount.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "shift amount is greater than the type size")) {
+    if (cause == .shift_rhs_too_big) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/shift right by huge amount.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "shift amount is greater than the type size")) {
+    if (cause == .shift_rhs_too_big) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/signed integer division overflow - vectors.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer overflow")) {
+    if (cause == .integer_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/signed integer division overflow.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer overflow")) {
+    if (cause == .integer_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/signed integer not fitting in cast to unsigned integer - widening.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "attempt to cast negative value to unsigned integer")) {
+    if (cause == .negative_to_unsigned) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/signed integer not fitting in cast to unsigned integer.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "attempt to cast negative value to unsigned integer")) {
+    if (cause == .negative_to_unsigned) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/signed shift left overflow.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "left shift overflowed bits")) {
+    if (cause == .shl_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/signed shift right overflow.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "right shift overflowed bits")) {
+    if (cause == .shr_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/signed-unsigned vector cast.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "attempt to cast negative value to unsigned integer")) {
+    if (cause == .negative_to_unsigned) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/slice sentinel mismatch - floats.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "sentinel mismatch: expected 1.2e0, found 4e0")) {
+    if (cause == .sentinel_mismatch_other) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/slice sentinel mismatch - optional pointers.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "sentinel mismatch: expected null, found i32@10")) {
+    if (cause == .sentinel_mismatch_other) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/slice slice sentinel mismatch.zig

@@ -1,9 +1,14 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "sentinel mismatch: expected 0, found 4")) {
-        std.process.exit(0);
+    switch (cause) {
+        .sentinel_mismatch_usize => |info| {
+            if (info.expected == 0 and info.found == 4) {
+                std.process.exit(0);
+            }
+        },
+        else => {},
     }
     std.process.exit(1);
 }

test/cases/safety/slice start index greater than end index.zig

@@ -1,9 +1,14 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "start index 10 is larger than end index 1")) {
-        std.process.exit(0);
+    switch (cause) {
+        .start_index_greater_than_end => |info| {
+            if (info.start == 10 and info.end == 1) {
+                std.process.exit(0);
+            }
+        },
+        else => {},
     }
     std.process.exit(1);
 }

test/cases/safety/slice with sentinel out of bounds - runtime len.zig

@@ -1,9 +1,14 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "index out of bounds: index 5, len 4")) {
-        std.process.exit(0);
+    switch (cause) {
+        .index_out_of_bounds => |info| {
+            if (info.index == 5 and info.len == 4) {
+                std.process.exit(0);
+            }
+        },
+        else => {},
     }
     std.process.exit(1);
 }

test/cases/safety/slice with sentinel out of bounds.zig

@@ -1,9 +1,14 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "index out of bounds: index 5, len 4")) {
-        std.process.exit(0);
+    switch (cause) {
+        .index_out_of_bounds => |info| {
+            if (info.index == 5 and info.len == 4) {
+                std.process.exit(0);
+            }
+        },
+        else => {},
     }
     std.process.exit(1);
 }

test/cases/safety/slicing null C pointer - runtime len.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "attempt to use null value")) {
+    if (cause == .unwrap_null) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/slicing null C pointer.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "attempt to use null value")) {
+    if (cause == .unwrap_null) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/switch else on corrupt enum value - one prong.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "switch on corrupt value")) {
+    if (cause == .corrupt_switch) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/switch else on corrupt enum value - union.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "switch on corrupt value")) {
+    if (cause == .corrupt_switch) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/switch else on corrupt enum value.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "switch on corrupt value")) {
+    if (cause == .corrupt_switch) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/switch on corrupted enum value.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "switch on corrupt value")) {
+    if (cause == .corrupt_switch) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/switch on corrupted union value.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "switch on corrupt value")) {
+    if (cause == .corrupt_switch) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/truncating vector cast.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer cast truncated bits")) {
+    if (cause == .cast_truncated_data) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/unreachable.zig

@@ -1,9 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, ret_addr: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    _ = ret_addr;
-    if (std.mem.eql(u8, message, "reached unreachable code")) {
+    if (cause == .reached_unreachable) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/unsigned integer not fitting in cast to signed integer - same bit count.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer cast truncated bits")) {
+    if (cause == .cast_truncated_data) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/unsigned shift left overflow.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "left shift overflowed bits")) {
+    if (cause == .shl_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/unsigned shift right overflow.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "right shift overflowed bits")) {
+    if (cause == .shr_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/unsigned-signed vector cast.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer cast truncated bits")) {
+    if (cause == .cast_truncated_data) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/unwrap error switch.zig

@@ -1,9 +1,14 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "attempt to unwrap error: Whatever")) {
-        std.process.exit(0);
+    switch (cause) {
+        .unwrap_error => |err| {
+            if (err == error.Whatever) {
+                std.process.exit(0);
+            }
+        },
+        else => {},
     }
     std.process.exit(1);
 }

test/cases/safety/unwrap error.zig

@@ -1,9 +1,14 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "attempt to unwrap error: Whatever")) {
-        std.process.exit(0);
+    switch (cause) {
+        .unwrap_error => |err| {
+            if (err == error.Whatever) {
+                std.process.exit(0);
+            }
+        },
+        else => {},
     }
     std.process.exit(1);
 }

test/cases/safety/value does not fit in shortening cast - u0.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer cast truncated bits")) {
+    if (cause == .cast_truncated_data) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/value does not fit in shortening cast.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer cast truncated bits")) {
+    if (cause == .cast_truncated_data) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/vector integer addition overflow.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer overflow")) {
+    if (cause == .integer_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/vector integer multiplication overflow.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer overflow")) {
+    if (cause == .integer_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/vector integer negation overflow.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer overflow")) {
+    if (cause == .integer_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/vector integer subtraction overflow.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "integer overflow")) {
+    if (cause == .integer_overflow) {
         std.process.exit(0);
     }
     std.process.exit(1);

test/cases/safety/zero casted to error.zig

@@ -1,8 +1,8 @@
 const std = @import("std");
 
-pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
+pub fn panic(cause: std.builtin.PanicCause, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
     _ = stack_trace;
-    if (std.mem.eql(u8, message, "invalid error code")) {
+    if (cause == .invalid_error_code) {
         std.process.exit(0);
     }
     std.process.exit(1);