58f97fff10
lowerNullCoalesce fed resolveOptionalInner's .unresolved (returned for a non-optional lhs) into the merge-block params / optionalUnwrap / RHS target type, reaching codegen and panicking 'unresolved type reached LLVM emission'. Guard: when inferExprType(nc.lhs) is a resolved non-optional type, emit a located diagnostic and bail; an .unresolved lhs (prior error) is excluded to avoid double-report. ?? is optional-only per specs.md (error unions use or/catch), so rejecting a failable lhs is correct; comptime panic closed too. Regression: examples/diagnostics/1200-diagnostics-null-coalesce-non-optional.sx. Verified by 3 adversarial reviews, suite 790/0. Filed adjacent bug 0180 (?? lowering defects for generic/alias/tuple optional lhs).
18 lines
924 B
Plaintext
18 lines
924 B
Plaintext
// `??` (null-coalesce) requires an optional left operand. A resolved
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// non-optional lhs is malformed user input and must be a clean, located type
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// error — not a compiler crash. Regression (issue 0172): `lowerNullCoalesce`
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// used to feed the `.unresolved` inner type (from `resolveOptionalInner` on a
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// non-optional lhs) straight into the merge-block params / `optionalUnwrap` /
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// the RHS target type, which reached emit_llvm's "unresolved type reached LLVM
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// emission" panic (exit 134) with no diagnostic. A guard now inspects the
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// inferred lhs type: a resolved non-optional emits this error and bails before
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// codegen; an already-`.unresolved` lhs (a prior error, e.g. undefined name)
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// passes through untouched so the original diagnostic isn't double-reported.
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#import "modules/std.sx";
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main :: () {
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x := 5 ?? 7; // <- left operand of '??' must be an optional, but has type 'i64'
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print("{}\n", x);
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}
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