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docs: tuple syntax cutover — Tuple(...) type, .(...) value, channel-outside-Tuple failables

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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.
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agra
2026-06-25 18:41:22 +03:00
parent 1dfc22794e
commit 40b5fb5f7e
17 changed files with 184 additions and 103 deletions
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6
examples/diagnostics/1116-diagnostics-tuple-type-nontype-element-rejected.sx
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@@ -1,6 +1,6 @@
// A tuple literal used in a type position (`(i32, i32)` reinterpreted as a tuple
// type at a type-demanding site like `size_of`) must list only types. A non-type
// element — here the `1` in `(i32, 1)` — is rejected with a user-facing
// A tuple type (`Tuple(i32, i32)` at a type-demanding site like `size_of`) must
// list only types. A non-type
// element — here the `1` in `Tuple(i32, 1)` — is rejected with a user-facing
// diagnostic instead of silently fabricating an `i64` field for that slot.
// Regression (issue 0067).
// Expected: a clean "tuple type element is not a type" error at the `1`; exit 1.