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Merge pull request #1130 from rtfeldman/rc-missed-opt

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fix missed RC optimization opportunity
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Richard Feldman 2021-03-30 23:06:41 -04:00 • committed by GitHub
commit 4dc1018aee
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1 changed files with 10 additions and 1 deletions
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11
compiler/mono/src/expand_rc.rs
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@ -441,7 +441,7 @@ fn expand_and_cancel<'a>(env: &mut Env<'a, '_>, stmt: &'a Stmt<'a>) -> &'a Stmt<
structure,
index,
field_layouts,
..
wrapped,
} => {
let entry = env
.alias_map
@ -450,6 +450,15 @@ fn expand_and_cancel<'a>(env: &mut Env<'a, '_>, stmt: &'a Stmt<'a>) -> &'a Stmt<
entry.insert(*index, symbol);
// fixes https://github.com/rtfeldman/roc/issues/1099
if matches!(
wrapped,
Wrapped::SingleElementRecord | Wrapped::RecordOrSingleTagUnion
) {
env.layout_map
.insert(*structure, Layout::Struct(field_layouts));
}
// if the field is a struct, we know its constructor too!
let field_layout = &field_layouts[*index as usize];
env.try_insert_struct_info(symbol, field_layout);