6b5edc77b4
The cursor clause now matches the collection form's ': (capture)' — 'for 0..N: (i)' instead of 'for 0..N (i)'. The colon is required when a cursor is present; the no-cursor form 'for 0..N { }' is unchanged. Updated examples/200, the pack-index doc comment, and the spec.
30 lines
974 B
Plaintext
30 lines
974 B
Plaintext
// Variadic heterogeneous type packs — Step 2.6: indexing a pack with a
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// RUNTIME index is a compile error.
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//
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// Per locked Decision 1, a pack is comptime-only and has NO runtime
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// representation — so `args[i]` is valid only when `i` is a compile-time
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// constant (a literal, or an `inline for` cursor). A runtime index (here a
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// `while`-loop counter) must produce a clear diagnostic, not the confusing
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// "unresolved 'args'" the slice-index fall-through used to give. To walk a
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// pack, use `inline for 0..args.len: (i) { ... }`, which unrolls so each
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// `args[i]` is a comptime index.
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#import "modules/std.sx";
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count_anys :: (..$args) -> s64 {
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total : s64 = 0;
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i : s64 = 0;
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while i < args.len {
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x : Any = args[i]; // ERROR: runtime index into a comptime-only pack
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_ = x;
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total = total + 1;
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i = i + 1;
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}
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return total;
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}
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main :: () -> s32 {
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print("{}\n", count_anys(10, "hi", 2.5, true));
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return 0;
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}
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