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guard exhaustiveness

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This commit is contained in:
Folkert 2020-03-21 23:33:37 +01:00
parent a16d48a6a9
commit 1f3b8f7d68
4 changed files with 104 additions and 43 deletions
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41
compiler/mono/src/decision_tree.rs
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@ -444,26 +444,25 @@ fn to_relevant_branch<'a>(
start,
found_pattern: (guard, pattern),
end,
} => match test {
Test::Guarded(None, _guard_expr) => {
// theory: Some(branch)
todo!();
} => {
let actual_test = match test {
Test::Guarded(Some(box_test), _guard_expr) => box_test,
_ => test,
};
if let Some(mut new_branch) =
to_relevant_branch_help(actual_test, path, start, end, branch, guard, pattern)
{
// guards can/should only occur at the top level. When we recurse on these
// branches, the guard is not relevant any more. Not setthing the guard to None
// leads to infinite recursion.
new_branch.patterns.iter_mut().for_each(|(_, guard, _)| {
*guard = None;
});
new_branches.push(new_branch);
}
Test::Guarded(Some(box_test), _guard_expr) => {
if let Some(new_branch) =
to_relevant_branch_help(box_test, path, start, end, branch, guard, pattern)
{
new_branches.push(new_branch);
}
}
_ => {
if let Some(new_branch) =
to_relevant_branch_help(test, path, start, end, branch, guard, pattern)
{
new_branches.push(new_branch);
}
}
},
}
}
}
@ -502,7 +501,7 @@ fn to_relevant_branch_help<'a>(
tag_id: *tag_id,
path: Box::new(path.clone()),
},
guard.clone(),
None,
pattern,
)
});
@ -548,7 +547,7 @@ fn to_relevant_branch_help<'a>(
tag_id: *tag_id,
path: Box::new(path.clone()),
},
guard.clone(),
None,
pattern,
)
});