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fix: diagnose unknown generic #builtin instead of silently returning 0 (issue 0144)

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A bodiless #builtin with a $T: Type param routes through monomorphization.
When resolveBuiltin returned null for an unrecognized name, the builtin-body
branch fell through to ensureTerminator's constInt(0) -- a silent-fallback
default the CLAUDE.md REJECTED PATTERNS forbid. Emit a loud
'error: unknown #builtin <name>' diagnostic instead.

Regression: examples/1189-diagnostics-unknown-builtin.sx
This commit is contained in:
agra
2026-06-21 09:10:38 +03:00
parent 6ed29621ad
commit ad45ae07ef
6 changed files with 41 additions and 0 deletions
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examples/expected/1189-diagnostics-unknown-builtin.exit Normal file
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examples/expected/1189-diagnostics-unknown-builtin.stderr Normal file
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error: unknown #builtin 'mystery'
--> examples/1189-diagnostics-unknown-builtin.sx:12:1
|
12 | mystery :: ($T: Type, x: T) -> T #builtin;
| ^^^^^^^

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examples/expected/1189-diagnostics-unknown-builtin.stdout Normal file
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