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.
21 lines
929 B
Plaintext
21 lines
929 B
Plaintext
// A closure literal whose body `raise`s but is annotated non-failable (or has
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// no `!` in its return) gets a LAMBDA-SPECIFIC diagnostic telling the user to
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// declare the failable return explicitly (ERR E5.1 sub-feature 1). This is the
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// closure analog of the top-level "raise is only valid inside a failable
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// function" error — failability is never inferred for a lambda, it must be
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// declared, so a raising lambda with no `!` is a hard error pointing at the fix.
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#import "modules/std.sx";
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E :: error { Neg }
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take :: (cb: Closure(i32) -> i32 !E, x: i32) -> i32 { return cb(x) catch (e) -1; }
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main :: () -> i32 {
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// `-> i32` (non-failable) but the body raises → lambda-specific hint:
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// "lambda body raises; declare its return type explicitly with
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// `-> (T, !)` or `-> (T, !Named)`"
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print("{}\n", take(closure((x: i32) -> i32 { if x < 0 { raise error.Neg; } return x; }), -1));
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return 0;
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}
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