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improve error message when wrong type returned

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closes #1650
This commit is contained in:
Andrew Kelley 2018-11-19 11:22:57 -05:00
parent 81d9403dce
commit 2f5d1ec500
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GPG Key ID: 4E7CD66038A4D47C
2 changed files with 8 additions and 1 deletions
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8
src/ir.cpp
View File

@ -34,6 +34,7 @@ struct IrAnalyze {
size_t old_bb_index;
size_t instruction_index;
ZigType *explicit_return_type;
AstNode *explicit_return_type_source_node;
ZigList<IrInstruction *> src_implicit_return_type_list;
IrBasicBlock *const_predecessor_bb;
};
@ -11162,8 +11163,12 @@ static IrInstruction *ir_analyze_instruction_return(IrAnalyze *ira, IrInstructio
return ir_unreach_error(ira);
IrInstruction *casted_value = ir_implicit_cast(ira, value, ira->explicit_return_type);
if (type_is_invalid(casted_value->value.type))
if (type_is_invalid(casted_value->value.type) && ira->explicit_return_type_source_node != nullptr) {
ErrorMsg *msg = ira->codegen->errors.last();
add_error_note(ira->codegen, msg, ira->explicit_return_type_source_node,
buf_sprintf("return type declared here"));
return ir_unreach_error(ira);
}
if (casted_value->value.special == ConstValSpecialRuntime &&
casted_value->value.type->id == ZigTypeIdPointer &&
@ -21213,6 +21218,7 @@ ZigType *ir_analyze(CodeGen *codegen, IrExecutable *old_exec, IrExecutable *new_
ZigFn *fn_entry = exec_fn_entry(old_exec);
bool is_async = fn_entry != nullptr && fn_entry->type_entry->data.fn.fn_type_id.cc == CallingConventionAsync;
ira->explicit_return_type = is_async ? get_promise_type(codegen, expected_type) : expected_type;
ira->explicit_return_type_source_node = expected_type_source_node;
ira->old_irb.codegen = codegen;
ira->old_irb.exec = old_exec;

1
test/compile_errors.zig
View File

@ -3219,6 +3219,7 @@ pub fn addCases(cases: *tests.CompileErrorContext) void {
\\fn something() anyerror!void { }
,
".tmp_source.zig:2:5: error: expected type 'void', found 'anyerror'",
".tmp_source.zig:1:15: note: return type declared here",
);
cases.add(