c03db7938c
`xs.<method>` over a constrained pack projects a (zero-arg) protocol method across every element into a tuple: `xs.get` ≈ `(xs[0].get(), …, xs[N-1].get())`. lowerFieldAccess intercepts `xs.<m>` on a pack base (where <m> is a protocol method) and synthesizes/lowers `xs[i].<m>()` per element into a tuple_init. For a parameterised `Box(T)` the projected tuple is heterogeneous (each element returns its own T). examples/196-pack-value-projection.sx. Surfaced and fixed a pre-existing bug: inferExprType didn't handle tuple field access (`t.0` / `t.x`), so a mixed-size tuple like `(42, "hi")` inferred the string field as s64 — the wrong type then drove a bad `print` pack mangle and coerced the string to i64 (garbage). Added the tuple arm (numeric + named). Regression: a `(s64, string)` case in examples/190-tuple-values.sx.
29 lines
932 B
Plaintext
29 lines
932 B
Plaintext
// Feature 1 — value-position pack projection: `xs.<method>` projects a
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// (zero-arg) protocol method over every element into a TUPLE of the per-element
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// results. For a parameterised `Box(T)`, each element's method returns its own
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// `T`, so the projected tuple is heterogeneous.
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//
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// xs.get ≈ (xs[0].get(), xs[1].get())
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#import "modules/std.sx";
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Box :: protocol(T: Type) {
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get :: () -> T;
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}
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IntCell :: struct { v: s64; }
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StrCell :: struct { s: string; }
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impl Box(s64) for IntCell { get :: (self: *IntCell) -> s64 => self.v; }
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impl Box(string) for StrCell { get :: (self: *StrCell) -> string => self.s; }
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show :: (..xs: Box) -> void {
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vals := xs.get; // tuple (s64, string)
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print("0={} 1={}\n", vals.0, vals.1);
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}
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main :: () -> s32 {
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show(IntCell.{ v = 42 }, StrCell.{ s = "hi" });
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show(StrCell.{ s = "x" }, IntCell.{ v = 7 }); // order swapped → (string, s64)
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0;
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}
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