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missing match arm add test cases to demonstrate enum tuple struct with ellipsis behavior

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This commit is contained in:
Josh Mcguigan 2020-04-11 21:20:52 -07:00
parent a59179ac2d
commit bb2e5308b7
1 changed files with 64 additions and 0 deletions
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64
crates/ra_hir_ty/src/_match.rs
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@ -1484,6 +1484,45 @@ mod tests {
check_no_diagnostic(content);
}
#[test]
fn enum_tuple_partial_ellipsis_no_diagnostic() {
let content = r"
enum Either {
A(bool, bool, bool, bool),
B,
}
fn test_fn() {
match Either::B {
Either::A(true, .., true) => {},
Either::A(true, .., false) => {},
Either::A(false, .., true) => {},
Either::A(false, .., false) => {},
Either::B => {},
}
}
";
check_no_diagnostic(content);
}
#[test]
fn enum_tuple_ellipsis_no_diagnostic() {
let content = r"
enum Either {
A(bool, bool, bool, bool),
B,
}
fn test_fn() {
match Either::B {
Either::A(..) => {},
Either::B => {},
}
}
";
check_no_diagnostic(content);
}
}
#[cfg(test)]
@ -1628,4 +1667,29 @@ mod false_negatives {
// See comments on `tuple_of_bools_with_ellipsis_at_end_missing_arm`.
check_no_diagnostic(content);
}
#[test]
fn enum_tuple_partial_ellipsis_missing_arm() {
let content = r"
enum Either {
A(bool, bool, bool, bool),
B,
}
fn test_fn() {
match Either::B {
Either::A(true, .., true) => {},
Either::A(true, .., false) => {},
Either::A(false, .., false) => {},
Either::B => {},
}
}
";
// This is a false negative.
// The `..` pattern is currently lowered to a single `Pat::Wild`
// no matter how many fields the `..` pattern is covering. This
// causes us to return a `MatchCheckErr::MalformedMatchArm` in
// `Pat::specialize_constructor`.
check_no_diagnostic(content);
}
}