989e18b760
Replace the bare-paren tuple grammar with explicit, position-unambiguous
forms, mirroring how structs work:
type `(A, B)` -> `Tuple(A, B)` (named keeps `:`)
value `(a, b)` -> `.(a, b)` (named uses `=`)
typed (new) -> `Tuple(A, B).(a, b)` (like `Point.{...}`)
failable `-> (T, !)` -> `-> T !`
`-> (T1, T2, !)`-> `-> Tuple(T1, T2) !` (channel outside Tuple)
Bare `(...)` is now grouping only, everywhere; a comma in bare parens is a
hard error with a migration hint. Grouping, function types `(A, B) -> R`,
param lists, lambdas, and match bindings are unaffected.
`Tuple(...)` is strictly a TYPE in every position (including `size_of` /
`type_info` args); a tuple VALUE comes only from `.(...)` (anonymous) or
`Tuple(...).(...)` (explicitly typed). A bare `Tuple(1, 2)` is a tuple
type with non-type elements -> rejected.
The ~110 tuple-bearing corpus files were migrated with a one-shot
AST-aware migrator (the `sx migrate` tool from the prior commit, removed
here). New examples: 0130 (new syntax), 0131 (typed construction), 1060
(named-tuple failable return). 1116 golden updated for the new hint text.
26 lines
937 B
Plaintext
26 lines
937 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 `(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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