87f739cef2
`..xs: Protocol` (a bare protocol, no `[]`, no `$`) on a variadic parameter now parses to `ast.Param.is_pack = true` — a heterogeneous protocol-constrained pack, distinct from a slice variadic (`..xs: []T`, is_pack=false) and the comptime type-pack (`..$args`, is_comptime=true). Parser-only: sema/lowering for the pack form land in Phase 2; existing forms are unaffected (zero examples used a bare non-slice variadic annotation). Adds three parser unit tests and examples/probes/pack-param-parses.sx.
23 lines
1003 B
Plaintext
23 lines
1003 B
Plaintext
// Feature 1 / Step 1.1 — pack-constrained variadic parameter PARSES.
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//
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// Parse-only probe. The protocol-constrained variadic `..sources: Protocol`
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// (no `[]`, no `$`) now parses to an `ast.Param` with `is_pack = true`,
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// distinct from a slice variadic (`..parts: []T`, `is_pack = false`) and the
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// comptime type-pack (`..$args`, `is_comptime = true`). Sema/lowering for the
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// pack form arrive in Phase 2 — do NOT expect this to compile/run yet.
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//
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// The authoritative checks are the parser unit tests in src/parser.zig
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// ("parse pack-constrained variadic parameter", and the two contrast tests).
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// Protocol-constrained pack (the new form):
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map :: (..sources: ValueListenable) => sources;
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// With a fixed prefix before the pack:
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combine :: (label: string, ..sources: ValueListenable) => label;
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// Contrast — slice variadic (is_pack = false):
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join :: (..parts: []string) => parts;
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// Contrast — comptime type pack (is_comptime = true, is_pack = false):
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pick :: (..$args) => args[0];
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