c490ffcfe9
An identifier used in a type position that resolved to nothing fell through
to `type_bridge.resolveTypeName`'s empty-struct-stub fallback, silently
interning a 0-field struct named after the identifier. A value parameter
mistakenly used as a type (`(T: Type, ...) -> T`, missing the `$`) or a
typo'd type name therefore compiled and ran, rendering as `T{}`.
New post-scan diagnostic pass `checkUnknownTypeNames` (lower.zig Pass 1f)
walks every main-file function signature and non-generic struct field type
and rejects any leaf name that is not a primitive, an in-scope generic param
(`$T` / `type_params`), a declared type, or a real (non-stub) registered
type. The load-bearing empty-struct stub is left intact — forward references
and foreign-class opaque types still depend on it during the scan — and the
pass runs before body lowering, so `hasErrors()` halts the build before any
stub reaches codegen.
A value param used as a type gets a tailored hint to write `$T: Type`; a
genuine unknown gets "unknown type 'X'". Imported concrete types are
recognized via the type table, and inline compound spellings (`[:0]u8`),
arbitrary-width ints (`u1`/`u2`), and `$`-introduced generics (`-> $R`) are
exempted to avoid false positives.
Regressions: examples/1111 (tailored hint) + 1112 (typo'd field type).
12 lines
613 B
Plaintext
12 lines
613 B
Plaintext
error: 'T' is a value parameter, not a type; introduce a generic type parameter with `$T: Type`
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--> /Users/agra/projects/sx/examples/1111-diagnostics-nondollar-type-param-rejected.sx:6:37
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6 | idwrap :: (T: Type, f: Closure() -> T) -> T { return f(); }
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| ^
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error: 'T' is a value parameter, not a type; introduce a generic type parameter with `$T: Type`
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--> /Users/agra/projects/sx/examples/1111-diagnostics-nondollar-type-param-rejected.sx:6:43
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6 | idwrap :: (T: Type, f: Closure() -> T) -> T { return f(); }
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| ^
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