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Sema: resolve union fields before using getTagType

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Closes #13649
This commit is contained in:
Veikka Tuominen 2022-11-25 02:40:06 +02:00
parent bf62cb453b
commit 587ef60a28
2 changed files with 20 additions and 2 deletions
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6
src/Sema.zig
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@ -7580,7 +7580,8 @@ fn zirEnumToInt(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!A
const enum_tag: Air.Inst.Ref = switch (operand_ty.zigTypeTag()) {
.Enum => operand,
.Union => blk: {
const tag_ty = operand_ty.unionTagType() orelse {
const union_ty = try sema.resolveTypeFields(operand_ty);
const tag_ty = union_ty.unionTagType() orelse {
return sema.fail(
block,
operand_src,
@ -22713,7 +22714,8 @@ fn fieldPtr(
return inst;
}
}
if (child_type.unionTagType()) |enum_ty| {
const union_ty = try sema.resolveTypeFields(child_type);
if (union_ty.unionTagType()) |enum_ty| {
if (enum_ty.enumFieldIndex(field_name)) |field_index| {
const field_index_u32 = @intCast(u32, field_index);
var anon_decl = try block.startAnonDecl();

16
test/cases/compile_errors/union_fields_are_resolved_before_tag_type_is_needed.zig Normal file
View File

@ -0,0 +1,16 @@
const T = union(enum) {
a,
pub fn f(self: T) void {
_ = self;
}
};
pub export fn entry() void {
T.a.f();
}
// error
// backend=stage2
// target=native
//
// :8:8: error: no field or member function named 'f' in '@typeInfo(tmp.T).Union.tag_type.?'
// :1:11: note: enum declared here