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Handle multi pattern unbound list rest variables

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JRI98 2024-06-21 17:01:49 +01:00
parent 03eadc2e0f
commit f4551978ce
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4 changed files with 35 additions and 5 deletions
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9
crates/compiler/can/src/pattern.rs
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@ -207,7 +207,7 @@ pub struct ListPatterns {
/// [ .., A, B ] -> patterns = [A, B], rest = 0
/// [ A, .., B ] -> patterns = [A, B], rest = 1
/// [ A, B, .. ] -> patterns = [A, B], rest = 2
pub opt_rest: Option<(usize, Option<Symbol>)>,
pub opt_rest: Option<(usize, Option<Loc<Symbol>>)>,
}
impl ListPatterns {
@ -793,7 +793,8 @@ pub fn canonicalize_pattern<'a>(
pattern_as.identifier.value,
) {
Ok(symbol) => {
rest_name = Some(symbol);
rest_name =
Some(Loc::at(pattern_as.identifier.region, symbol));
}
Err(pattern) => {
opt_erroneous = Some(pattern);
@ -997,6 +998,10 @@ impl<'a> BindingsFromPattern<'a> {
| OpaqueNotInScope(..) => (),
List { patterns, .. } => {
stack.extend(patterns.patterns.iter().rev().map(Pattern));
if let Some((_, Some(rest_sym))) = &patterns.opt_rest {
return Some((rest_sym.value, rest_sym.region));
}
}
}
}