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feat(lang): a name is defined once, a local once per block, and a result is always returned

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L1. Two vars, consts, enums, properties or events of one name in a program are an error naming
both places (functions already were); the first used to win silently. A let / var of a name its
own block already declared is an error (it used to shadow). A function with a result type whose
body can reach its end without a return is an error, asked structurally of the body - a return,
an if/else or a match with a default arm whose every branch ends - rather than handing back
whatever the result slot held. The game, the lab and every package example pass all three;
the lab had one harmless shadow, and the game's split screens had two real bugs of the kind.
examples/rejected/ holds the four refusals, checked by the test runner's new reject_case.
Seed regenerated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Orkun ÇAKILKAYA 2026-09-23 23:55:20 +03:00
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bump: minor
type: feat
**A name is defined once, for every kind of declaration.** Two functions with one name were
already an error; two `var`s or `const`s (or an enum and a const), or two `property` / `event`
records, kept the first definition silently. A game lost months to it: two files both said
`KEY_LEFT`, one meaning an arrow key's code and one a binding slot, and the menus read the slot.
They are now an error that names both files and lines. `examples/rejected/` holds the two cases,
checked by a new `reject_case` in the test runner (an example the compiler must refuse).