Files
sx/examples/0171-types-undeclared-type-in-generic-struct-field.sx
agra d8076b9333 lang: rename signed integer types sN -> iN
Surface rename of the signed integer family: s1..s64 become i1..i64
(u1..u64, usize, isize unchanged). 'string' keeps the s-prefix arm in
name classification; width parsing moves to the i-prefix arm next to
isize.

Internal TypeId tags follow the surface (.s8/.s16/.s32/.s64 ->
.i8/.i16/.i32/.i64), as do mono-key mangle fragments (ptr_i64,
tu_i64_bool) and all display/diagnostic formatting (i{d}).

Migrated in the same sweep: stdlib + examples + issue repros + FFI C
companions (shared symbol names like ffi_id_i64), expected
stdout/stderr/ir snapshots, specs.md, readme.md, CLAUDE.md/AGENTS.md,
implementation_plan.md, docs/, issue writeups. Vendored stb_image and
historical flow state left untouched.

zig build test: 426/426; examples suite: 595/595.
2026-06-12 09:31:53 +03:00

30 lines
1.2 KiB
Plaintext

// A genuinely-undeclared type name used as a field type inside a MAIN-file
// GENERIC struct must emit a clean "unknown type" diagnostic, not silently
// compile.
//
// The `UnknownTypeChecker` used to SKIP generic structs entirely ("their field
// types reference the struct's own `$T`, resolved at instantiation"). That skip
// was too broad: a field type like `bad: MissingType` — which is NOT a type
// param and names no declared type — fell through the type leaf's empty-struct
// stub and the struct silently compiled, mis-sizing every downstream load.
//
// The checker now walks generic-struct fields with the struct's own type params
// (`$T`) in scope: `good: T` resolves (it IS a param) while `bad: MissingType`
// is reported. A value-param position (a `Vector` lane count, a `$N: u32` arg)
// is still skipped, so a valid generic struct keeps compiling unchanged.
//
// Expected: `error: unknown type 'MissingType'` pointing at the field; exit 1.
// Regression (stdlib E3).
#import "modules/std.sx";
Box :: struct($T: Type) {
good: T;
bad: MissingType;
}
main :: () -> i32 {
b : Box(i64) = .{ good = 7, bad = 0 };
print("{}\n", b.good);
return 0;
}