| author |  Rue04 <iokg04@gmail.com> 2026-07-15 23:04:54+02:00 |
| committer |  Matthew Lugg <mlugg@mlugg.co.uk> 2026-07-15 23:04:54+02:00 |
| log | 20befa4e64f1654fa3c69a0e7b0b194193c2ab27 |
| tree | e84c24f4d6a99cd6ff756f6bc80ed8c86f6be1b6 |
| parent | 9908b10d928a12731a288bd59068151d386efdac |
Sema: fix crash on invalid coercion from error union or optional
It seems the destination and source types were switched by accident, leading to an `unreachable` being reached in the following cases:
```zig
test {
const eu: anyerror!u8 = 10;
const i: comptime_int = eu;
_ = i;
}
test {
const op: ?u8 = 10;
const i: comptime_int = op;
_ = i;
}
```
Resolves: https://codeberg.org/ziglang/zig/issues/30597
Resolves: https://github.com/ziglang/zig/issues/25645
Reviewed-on: https://codeberg.org/ziglang/zig/pulls/35662
Reviewed-by: mlugg <mlugg@noreply.codeberg.org>2 files changed, 32 insertions(+), 2 deletions(-)
src- test
- cases
src/Sema.zig+2-2
| ... | ... | @@ -28356,7 +28356,7 @@ fn coerceExtra( |
| 28356 | 28356 | |
| 28357 | 28357 | // E!T to T |
| 28358 | 28358 | if (inst_ty.zigTypeTag(zcu) == .error_union and |
| 28359 | (try sema.coerceInMemoryAllowed(block, inst_ty.errorUnionPayload(zcu), dest_ty, false, target, dest_ty_src, inst_src, null)) == .ok) | |
| 28359 | (try sema.coerceInMemoryAllowed(block, dest_ty, inst_ty.errorUnionPayload(zcu), false, target, dest_ty_src, inst_src, null)) == .ok) | |
| 28360 | 28360 | { |
| 28361 | 28361 | try sema.errNote(inst_src, msg, "cannot convert error union to payload type", .{}); |
| 28362 | 28362 | try sema.errNote(inst_src, msg, "consider using 'try', 'catch', or 'if'", .{}); |
| ... | ... | @@ -28364,7 +28364,7 @@ fn coerceExtra( |
| 28364 | 28364 | |
| 28365 | 28365 | // ?T to T |
| 28366 | 28366 | if (inst_ty.zigTypeTag(zcu) == .optional and |
| 28367 | (try sema.coerceInMemoryAllowed(block, inst_ty.optionalChild(zcu), dest_ty, false, target, dest_ty_src, inst_src, null)) == .ok) | |
| 28367 | (try sema.coerceInMemoryAllowed(block, dest_ty, inst_ty.optionalChild(zcu), false, target, dest_ty_src, inst_src, null)) == .ok) | |
| 28368 | 28368 | { |
| 28369 | 28369 | try sema.errNote(inst_src, msg, "cannot convert optional to payload type", .{}); |
| 28370 | 28370 | try sema.errNote(inst_src, msg, "consider using '.?', 'orelse', or 'if'", .{}); |
test/cases/compile_errors/coercion_from_eu_or_optional_containing_or_to_comptime_int.zig created+30
| ... | ... | @@ -0,0 +1,30 @@ |
| 1 | comptime { | |
| 2 | const eu: anyerror!u8 = 10; | |
| 3 | const i: comptime_int = eu; | |
| 4 | _ = i; | |
| 5 | } | |
| 6 | ||
| 7 | comptime { | |
| 8 | const op: ?u8 = 10; | |
| 9 | const i: comptime_int = op; | |
| 10 | _ = i; | |
| 11 | } | |
| 12 | ||
| 13 | comptime { | |
| 14 | const op: anyerror!comptime_int = 10; | |
| 15 | const i: u8 = op; | |
| 16 | _ = i; | |
| 17 | } | |
| 18 | ||
| 19 | comptime { | |
| 20 | const op: ?comptime_int = 10; | |
| 21 | const i: u8 = op; | |
| 22 | _ = i; | |
| 23 | } | |
| 24 | ||
| 25 | // error | |
| 26 | // | |
| 27 | // :3:29: error: expected type 'comptime_int', found 'anyerror!u8' | |
| 28 | // :9:29: error: expected type 'comptime_int', found '?u8' | |
| 29 | // :15:19: error: expected type 'u8', found 'anyerror!comptime_int' | |
| 30 | // :21:19: error: expected type 'u8', found '?comptime_int' |