error[E0004]: non-exhaustive patterns: `Foo::A(false)`, `Foo::B(false)` and `Foo::C(false)` not covered
  --> $DIR/issue-56379.rs:8:11
   |
LL |     match Foo::A(true) {
   |           ^^^^^^^^^^^^ patterns `Foo::A(false)`, `Foo::B(false)` and `Foo::C(false)` not covered
   |
note: `Foo` defined here
  --> $DIR/issue-56379.rs:2:5
   |
LL | enum Foo {
   |      ---
LL |     A(bool),
   |     ^ not covered
LL |     B(bool),
   |     ^ not covered
LL |     C(bool),
   |     ^ not covered
   = note: the matched value is of type `Foo`
help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern, a match arm with multiple or-patterns as shown, or multiple match arms
   |
LL ~         Foo::C(true) => {}
LL +         Foo::A(false) | Foo::B(false) | Foo::C(false) => todo!()
   |

error: aborting due to previous error

For more information about this error, try `rustc --explain E0004`.