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
950 B
Plaintext
26 lines
950 B
Plaintext
// Feature 1 — materialize a tuple from a pack via `(..xs.method)` (Decision 2:
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// a pack is stored by materializing a tuple). `(..xs.get)` projects `get` over
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// the pack and collects the results into a real tuple value, which can then be
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// stored, indexed, and (for `Box(T)`) is heterogeneous per position.
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#import "modules/std.sx";
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Box :: protocol(T: Type) {
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get :: (self: *Self) -> T;
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}
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IntCell :: struct { v: i64; }
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StrCell :: struct { s: string; }
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impl Box(i64) for IntCell { get :: (self: *IntCell) -> i64 => self.v; }
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impl Box(string) for StrCell { get :: (self: *StrCell) -> string => self.s; }
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snapshot :: (..xs: Box) -> void {
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t := .(..xs.get); // tuple (i64, string) materialized from the pack
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print("0={} 1={}\n", t.0, t.1);
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}
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main :: () -> i32 {
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snapshot(IntCell.{ v = 42 }, StrCell.{ s = "hi" });
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snapshot(StrCell.{ s = "x" }, IntCell.{ v = 7 }); // order swapped → (string, i64)
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0
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}
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