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.
56 lines
1.8 KiB
Plaintext
56 lines
1.8 KiB
Plaintext
// Tuple values: construction, element access, struct-field storage,
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// return, and operators. Regression for the tuple-construction bug where
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// an inferred `:=` tuple literal lowered its element values under the
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// enclosing fn's (narrower) return `target_type`, mismatching the
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// independently-inferred s64 field types and yielding garbage on read.
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#import "modules/std.sx";
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Box :: struct { xs: (s32, s32); }
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swap :: (a: s64, b: s64) -> (s64, s64) { (b, a); }
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fst :: (t: (s64, s64)) -> s64 { t.0; }
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main :: () -> s32 {
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// Inferred positional tuple + numeric field access.
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pair := (40, 2);
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print("pair {} {}\n", pair.0, pair.1);
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// Named tuple: named + numeric access.
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named := (x: 10, y: 20);
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print("named {} {} {}\n", named.x, named.0, named.1);
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// Element into a typed local (access path, not just print).
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a : s64 = pair.0;
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b : s64 = pair.1;
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print("locals {} {}\n", a, b);
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// Tuple-typed struct field: store a tuple value, read both elements.
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box : Box = ---;
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box.xs = (7, 9);
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print("field {} {}\n", box.xs.0, box.xs.1);
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// Return a tuple from a function.
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s := swap(1, 2);
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print("ret {} {}\n", s.0, s.1);
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// Pass a tuple by value.
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print("pass {}\n", fst((11, 22)));
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// Operators: equality, concatenation, repetition, membership, lex.
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print("eq {}\n", (1, 2) == (1, 2));
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c := (1, 2) + (3, 4);
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print("concat {} {}\n", c.0, c.3);
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r := (1, 2) * 3;
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print("rep {} {}\n", r.0, r.5);
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print("mem {}\n", 3 in (1, 2, 3));
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print("lex {}\n", (1, 2) < (1, 3));
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// Mixed-size fields: a tuple with both an s64 and a string (16-byte fat
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// pointer). Field types are tracked per-position, so reading each back is
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// typed correctly (s64 prints as a number, string as text).
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mixed := (42, "hi");
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print("mixed {} {}\n", mixed.0, mixed.1);
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0;
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}
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