refactor(parser): separate binding patterns from assignment targets 馃З - #225
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timfennis
commented
Sep 9, 2026
timfennis
commented
Sep 9, 2026
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Lvaluerepresented both declarations and writes, forcing the analyser and compiler to handle impossible index/member declarations. Split it intoBindingPatternfor declarations, parameters, and loop binders, andAssignmentTargetfor writes. Update parser, analyser, compiler, and LSP consumers around those roles.Both representations have location wrappers with a
NodeIdand complete source span, including nested destructuring elements. Consuming expression conversion preserves node identities; receivers and indices remain expressions. Retain identifier token spans separately so parenthesized targets still give precise definition locations. Existing resolution and inferred-type fields remain in the AST for the current analyser.Preserve the current accepted syntax, overload resolution, assignment evaluation order, and closure behavior. Function parameters still require identifiers, and member targets remain forbidden inside destructuring.
Validation:
cargo test --workspace --locked: 659 tests passed, including six new parser tests and two LSP definition tests.cargo build --no-default-features --locked: passed.cargo fmt --all --checkandgit diff --check: passed.AI disclosure: Codex implemented this refactor, added the tests, and wrote this PR description from a design discussed with the maintainer.