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tagged union field access prioritizes members over enum tags 

closes #959
master
Andrew Kelley 2018-05-07 16:43:20 -04:00
parent 2f633452bb
commit 77a1a216d2
2 changed files with 22 additions and 9 deletions
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19
src/ir.cpp
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@ -13736,7 +13736,16 @@ static TypeTableEntry *ir_analyze_instruction_field_ptr(IrAnalyze *ira, IrInstru
create_const_enum(child_type, &field->value), child_type,
ConstPtrMutComptimeConst, ptr_is_const, ptr_is_volatile);
}
} else if (child_type->id == TypeTableEntryIdUnion &&
}
ScopeDecls *container_scope = get_container_scope(child_type);
if (container_scope != nullptr) {
auto entry = container_scope->decl_table.maybe_get(field_name);
Tld *tld = entry ? entry->value : nullptr;
if (tld) {
return ir_analyze_decl_ref(ira, &field_ptr_instruction->base, tld);
}
}
if (child_type->id == TypeTableEntryIdUnion &&
(child_type->data.unionation.decl_node->data.container_decl.init_arg_expr != nullptr ||
child_type->data.unionation.decl_node->data.container_decl.auto_enum))
{
@ -13753,14 +13762,6 @@ static TypeTableEntry *ir_analyze_instruction_field_ptr(IrAnalyze *ira, IrInstru
ConstPtrMutComptimeConst, ptr_is_const, ptr_is_volatile);
}
}
ScopeDecls *container_scope = get_container_scope(child_type);
if (container_scope != nullptr) {
auto entry = container_scope->decl_table.maybe_get(field_name);
Tld *tld = entry ? entry->value : nullptr;
if (tld) {
return ir_analyze_decl_ref(ira, &field_ptr_instruction->base, tld);
}
}
ir_add_error(ira, &field_ptr_instruction->base,
buf_sprintf("container '%s' has no member called '%s'",
buf_ptr(&child_type->name), buf_ptr(field_name)));

12
test/cases/union.zig
View File

@ -272,3 +272,15 @@ const PartialInstWithPayload = union(enum) {
Compiled: i32,
};
test "access a member of tagged union with conflicting enum tag name" {
const Bar = union(enum) {
A: A,
B: B,
const A = u8;
const B = void;
};
comptime assert(Bar.A == u8);
}