error[E0004]: non-exhaustive patterns: `A(false)`, `B(false)` and `C(false)` not covered
  --> $DIR/issue-56379.rs:8:11
   |
LL | / enum Foo {
LL | |     A(bool),
   | |     - not covered
LL | |     B(bool),
   | |     - not covered
LL | |     C(bool),
   | |     - not covered
LL | | }
   | |_- `Foo` defined here
...
LL |       match Foo::A(true) {
   |             ^^^^^^^^^^^^ patterns `A(false)`, `B(false)` and `C(false)` not covered
   |
   = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
   = note: the matched value is of type `Foo`

error: aborting due to previous error

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