pub fn emit_expr(
emitter: &mut FunctionEmitter<'_>,
ctx: &CodegenCtx<'_>,
id: ExprId,
) -> Result<(), CompilerFailure>Expand description
Emit code for the expression at id, leaving its result on the Wasm
stack. Records the expression’s source span against the emitter so the
DWARF wiring task can recover instruction-offset → source-position
mappings later.