Andreas Kling 18c40a1328 LibJS/Rust: Fix has_parameter_expressions and TDZ checks for arguments ...

Fix two bugs in the Rust bytecode codegen:

1. has_parameter_expressions incorrectly treated any destructuring
   parameter as a "parameter expression", when it should only do so
   for patterns that contain expressions (defaults or computed keys).
   This caused an unnecessary CreateLexicalEnvironment for simple
   destructuring like `function f({a, b}) {}`. The same bug existed
   in both codegen.rs and lib.rs (SFD metadata computation).

2. emit_set_variable used is_local_lexically_declared(index) for
   argument locals, but that function indexes into the local_variables
   array using the argument's index, checking the wrong variable.
   This caused spurious ThrowIfTDZ instructions when assigning to
   function arguments that happened to share an index with an
   uninitialized let/const variable.

2026-03-01 21:20:54 +01:00

..

expected

LibJS/Rust: Fix has_parameter_expressions and TDZ checks for arguments

2026-03-01 21:20:54 +01:00

input

LibJS/Rust: Fix has_parameter_expressions and TDZ checks for arguments

2026-03-01 21:20:54 +01:00

output

LibJS: Move tests to /Tests/LibJS

2026-01-22 07:46:48 -05:00