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reach the unreachable

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This commit is contained in:
Folkert 2021-01-15 02:09:36 +01:00
parent 51cad15399
commit 167858ef06
4 changed files with 116 additions and 32 deletions
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4
compiler/mono/src/decision_tree.rs
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@ -210,6 +210,7 @@ fn flatten_patterns(branch: Branch) -> Branch {
for path_pattern in branch.patterns {
flatten(path_pattern, &mut result);
}
Branch {
goal: branch.goal,
patterns: result,
@ -227,7 +228,7 @@ fn flatten<'a>(
tag_id,
tag_name,
layout,
} if union.alternatives.len() == 1 => {
} if union.alternatives.len() == 1 && !matches!(layout, Layout::NullableUnion { .. } ) => {
// TODO ^ do we need to check that guard.is_none() here?
let path = path_pattern.0;
@ -890,6 +891,7 @@ pub fn optimize_when<'a>(
ret_layout: Layout<'a>,
opt_branches: bumpalo::collections::Vec<'a, (Pattern<'a>, Guard<'a>, Stmt<'a>)>,
) -> Stmt<'a> {
dbg!(&opt_branches);
let (patterns, _indexed_branches) = opt_branches
.into_iter()
.enumerate()