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sema: add more info to error message for invalid comptime union field access

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This commit is contained in:
John Schmidt 2022-03-18 17:35:30 +01:00
parent 91eb1af917
commit 8f0dac01ef
1 changed files with 9 additions and 3 deletions
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12
src/Sema.zig
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@ -17484,9 +17484,15 @@ fn unionFieldVal(
if (tag_matches) {
return sema.addConstant(field.ty, tag_and_val.val);
} else {
// TODO enhance this saying which one was active
// and which one was accessed, and showing where the union was declared.
return sema.fail(block, src, "access of inactive union field", .{});
const msg = msg: {
const active_index = tag_and_val.tag.castTag(.enum_field_index).?.data;
const active_field_name = union_obj.fields.keys()[active_index];
const msg = try sema.errMsg(block, src, "access of union field '{s}' while field '{s}' is active", .{ field_name, active_field_name });
errdefer msg.destroy(sema.gpa);
try sema.addDeclaredHereNote(msg, union_ty);
break :msg msg;
};
return sema.failWithOwnedErrorMsg(block, msg);
}
},
.Packed, .Extern => {