a7dcb23b70
A failed value-param bind on a type-returning function (e.g.
`MakeC :: ($K: Count, $T: Type) -> Type { return [K]T; }` with
`a : MakeC(5_000_000_000, s64)`) emitted its correct range diagnostic
but then `instantiateTypeFunction` returned `null`, so
`resolveParameterizedWithBindings` fell through to an empty-struct
placeholder named after the function. The binding `a` got that
placeholder type, so a later `a.len` cascaded a bogus second error
`field 'len' not found on type 'MakeC'`.
The struct binder (`instantiateGenericStruct`) already returns
`.unresolved` here; the type-fn binder now matches it — a failed
value-param bind poisons to `.unresolved` instead of `null`, so the
caller propagates the diagnosed poison and the existing
`emitFieldError` suppression yields one clean diagnostic. Covers
every type-fn value-param failure mode: overflow via an aliased
constraint, a non-const arg, and an unknown type arg.
Regression: examples/1137-diagnostics-value-param-type-fn-no-cascade.sx
28 lines
1.3 KiB
Plaintext
28 lines
1.3 KiB
Plaintext
// A FAILED value-param bind on a type-RETURNING FUNCTION must emit exactly its
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// own diagnostic and NOT cascade a bogus `field '…' not found on '<fn>'` when the
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// binding is later field-accessed. The type-fn binder must poison the binding to
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// `.unresolved` (the diagnosed-poison sentinel) — exactly like the struct binder —
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// so the downstream `.len` is suppressed, not reported as a second error.
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//
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// Regression (issue 0083): the type-fn path (`instantiateTypeFunction`) fell
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// through to an empty-struct placeholder named after the function on a failed
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// value-param bind, so `a.len` produced a second `field 'len' not found on
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// 'MakeC'` error. The struct binder already returned `.unresolved` here; the
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// type-fn binder now matches it. Three failure modes, three clean diagnostics,
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// zero field cascades:
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// - value-param overflow via an aliased integer constraint (`$K: Count`),
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// - a non-const value-param arg (`get()`),
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// - an unknown TYPE arg (`NoSuchType`) — must still report the unknown type.
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#import "modules/std.sx";
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Count :: u32;
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MakeC :: ($K: Count, $T: Type) -> Type { return [K]T; }
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get :: () -> u32 { return 4; }
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main :: () {
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a : MakeC(5000000000, s64) = ---;
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b : MakeC(get(), s64) = ---;
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c : MakeC(3, NoSuchType) = ---;
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print("unreachable {} {} {}\n", a.len, b.len, c.len);
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}
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