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fix dropping the wrong argument for List.map when it captures #6108

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Nov 28, 2023
Merged

fix dropping the wrong argument for List.map when it captures #6108

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20 changes: 19 additions & 1 deletion crates/compiler/mono/src/code_gen_help/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -673,7 +673,25 @@ impl<'a> CallerProc<'a> {

let argument_layouts = match capture_layout {
None => passed_function.argument_layouts,
Some(_) => &passed_function.argument_layouts[1..],
Some(_capture_layout) => {
let capture_layout_index = passed_function.argument_layouts.len() - 1;

#[cfg(debug_assertions)]
{
let passed_capture_layout =
passed_function.argument_layouts[capture_layout_index];
let repr = layout_interner.get_repr(passed_capture_layout);

if let LayoutRepr::LambdaSet(lambda_set) = repr {
assert!(layout_interner
.equiv(_capture_layout, lambda_set.runtime_representation()));
} else {
panic!("unexpected layout for capture argument");
}
}

&passed_function.argument_layouts[..capture_layout_index]
}
};

let capture_symbol = ARG_SYMBOLS[0];
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