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Fix bug that caused extraneous assignment in IR generation

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Previously we would expand optional record fields to assignments when
converting record patterns to "when" expressions. This resulted in
incorrect code being generated.
This commit is contained in:
ayazhafiz 2022-01-13 18:30:36 -05:00
parent 76d4d5d664
commit 9f78eb2e01
4 changed files with 3 additions and 33 deletions
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30
compiler/mono/src/ir.rs
View file

@ -1806,33 +1806,9 @@ fn patterns_to_when<'a>(
for (pattern_var, pattern) in patterns.into_iter() {
let context = crate::exhaustive::Context::BadArg;
let mono_pattern = match from_can_pattern(env, layout_cache, &pattern.value) {
Ok((pat, assignments)) => {
for (symbol, variable, expr) in assignments.into_iter().rev() {
if let Ok(old_body) = body {
let def = roc_can::def::Def {
annotation: None,
expr_var: variable,
loc_expr: Loc::at(pattern.region, expr),
loc_pattern: Loc::at(
pattern.region,
roc_can::pattern::Pattern::Identifier(symbol),
),
pattern_vars: std::iter::once((symbol, variable)).collect(),
};
let new_expr = roc_can::expr::Expr::LetNonRec(
Box::new(def),
Box::new(old_body),
variable,
);
let new_body = Loc {
region: pattern.region,
value: new_expr,
};
body = Ok(new_body);
}
}
Ok((pat, _assignments)) => {
// Don't apply any assignments (e.g. to initialize optional variables) yet.
// We'll take care of that later when expanding the new "when" branch.
pat
}
Err(runtime_error) => {