agra 6433eb6155 fix(diagnostics): point reserved-type-name binding errors at the binding (issue 0076) ...

The reserved-type-name binding diagnostic fired correctly but underlined the
enclosing statement / if / while / for / match / protocol / #objc_class block
because every binding-name check reused the parent `node.span`.

Thread each binding name's own span through the AST and parser, and pass it to
`checkBindingNames`:

- ast: add name spans to VarDecl, DestructureDecl, If/WhileExpr, ForExpr
  (capture + index), MatchArm, Catch/OnFailStmt, Protocol/ForeignMethodDecl.
- parser: populate each span at the binding site from the name token's loc;
  destructure reuses each target identifier's own span.
- semantic_diagnostics: every checkBindingName call now passes the binding's
  own span — no site falls back to node.span. fn/lambda params already used
  Param.name_span.

Carets now land on the offending identifier itself. New regression
examples/1125 asserts the protocol default-body and sx-defined #objc_class
method param spans; 0125/1119-1124 expected updated to the precise carets.

2026-06-03 22:06:56 +03:00

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