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.
23 lines
849 B
Plaintext
23 lines
849 B
Plaintext
// Value-carrying failable main `-> (int, !)` (ERR step E4.2). The entry-point
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// wrapper extracts the `{value, error}` tuple main returns: on success it exits
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// with the integer value (truncated to u8, like a plain integer main); on an
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// escaping error it prints the header + trace to stderr and exits 1 (the same
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// reporter as the pure `-> !` form — see 244). This run takes the success path.
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// Expected exit code: 64 (the returned value).
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#import "modules/std.sx";
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ParseErr :: error { Empty, BadDigit };
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inner :: (n: i32) -> i32 !ParseErr {
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if n == 0 { raise error.Empty; }
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if n < 0 { raise error.BadDigit; }
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return n * 2;
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}
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main :: () -> i32 !ParseErr {
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v := try inner(32); // succeeds → v = 64
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print("v = {}\n", v);
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return v; // success → exit code 64
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}
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