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Sema: fix casting runtime value to enum with comptime int tag type

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This commit is contained in:
Pavel Verigo 2024-01-28 17:15:33 +01:00 committed by Veikka Tuominen
parent c085c6ecdd
commit 96a5f7c8ed
2 changed files with 20 additions and 0 deletions
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6
src/Sema.zig
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@ -8657,6 +8657,12 @@ fn zirEnumFromInt(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError
return Air.internedToRef((try mod.getCoerced(int_val, dest_ty)).toIntern());
}
if (dest_ty.intTagType(mod).zigTypeTag(mod) == .ComptimeInt) {
return sema.failWithNeededComptime(block, operand_src, .{
.needed_comptime_reason = "value being casted to enum with 'comptime_int' tag type must be comptime-known",
});
}
if (try sema.typeHasOnePossibleValue(dest_ty)) |opv| {
const result = Air.internedToRef(opv.toIntern());
// The operand is runtime-known but the result is comptime-known. In

14
test/cases/compile_errors/enum_backed_by_comptime_int_must_be_casted_from_comptime_value.zig Normal file
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@ -0,0 +1,14 @@
export fn entry() void {
const Tag = enum(comptime_int) { a, b };
var v: u32 = 0;
_ = &v;
_ = @as(Tag, @enumFromInt(v));
}
// error
// backend=stage2
// target=native
//
// :6:31: error: unable to resolve comptime value
// :6:31: note: value being casted to enum with 'comptime_int' tag type must be comptime-known