8a875d354c
Using a bare pack name where a runtime value is required was silent garbage (f(xs)/return xs produced a stray pointer). Now a clear, context-tailored compile error: isPackName + diagPackAsValue, caught at lowerVarDecl (storage), lowerReturn (return), lowerFor (iterate), and an identifier-arm catch-all for call/other. Storage binds a placeholder so there is no cascade error. Suggestions point at WORKING fixes -- materialize (..xs), or declare the slice form ..xs: []P for runtime use. The plan category-B "spread ..xs" is broken (spreading a comptime pack into a []Any param crashes the LLVM verifier; filed issue 0053), so the diagnostics steer to the slice-of-protocol variadic instead. Repurposed examples/162-pack-bare-args.sx (was an aspirational bare-$args->[]Any auto-materialise, contradicting Decision 1) into the slice-form forward (..args: []Any). examples/203 is the four-category negative test. specs.md "Pack as value" updated. 238 examples + unit green.
26 lines
882 B
Plaintext
26 lines
882 B
Plaintext
// Step 2.7 — pack-as-value diagnostics. A pack is comptime-only (Decision 1),
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// so using the bare pack name where a runtime value is required is an error,
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// with a context-tailored suggestion. All four categories below fire (the
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// functions are monomorphized when called from main).
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#import "modules/std.sx";
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Show :: protocol { show :: () -> string; }
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A :: struct {}
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impl Show for A { show :: (self: *A) -> string => "A"; }
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sink :: (v: s64) -> void { _ = v; }
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storage :: (..xs: Show) -> void { y := xs; _ = y; } // A: store
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call :: (..xs: Show) -> void { sink(xs); } // B: pass to a call
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ret :: (..xs: Show) -> s64 { return xs; } // C: return
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iter :: (..xs: Show) -> void { for xs : (x) { _ = x; } } // D: runtime iterate
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main :: () -> s32 {
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storage(A.{});
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call(A.{});
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_ = ret(A.{});
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iter(A.{});
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0;
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}
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