40b5fb5f7e
Rewrite specs.md tuple/failable/pack/UFCS/grammar sections to the new syntax, update readme.md, and refresh stale tuple references in example header comments. Also fixes two pre-existing doc inaccuracies surfaced in review: drop the value-discarding `;` in the tuple-return examples, and correct the §13 function-type grammar production (optional param list + optional trailing `!` channel). Optional semantics unchanged. current/CHECKPOINT-LANG.md logs the cutover.
26 lines
942 B
Plaintext
26 lines
942 B
Plaintext
// Tuple element assignment + named tuples.
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// - `t.0 = v` writes one element in place (was a known gap: the lvalue path
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// looked the element up by name via getStructFields and left the pointee
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// `.unresolved`; now it indexes the tuple positionally like the read path).
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// - Named tuples `Tuple(x: T, y: U)` keep their field names through parsing and
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// type resolution, so `t.x` reads/writes by name (and `.0` by position).
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#import "modules/std.sx";
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main :: () -> i32 {
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// Positional element assignment.
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a : Tuple(i32, string) = ---;
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a.0 = 11;
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a.1 = "x";
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print("a: {} {}\n", a.0, a.1);
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// Named tuple: write + read by name, and read by position.
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p : Tuple(x: i32, y: string) = ---;
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p.x = 22;
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p.y = "y";
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print("p: x={} y={} .0={}\n", p.x, p.y, p.0);
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p.0 = 33; // position write reaches the same slot as .x
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print("p.x after .0=33: {}\n", p.x);
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0
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}
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