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Diffstat (limited to 'tests/ui/static/static-mut-not-pat.rs')
-rw-r--r-- | tests/ui/static/static-mut-not-pat.rs | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/tests/ui/static/static-mut-not-pat.rs b/tests/ui/static/static-mut-not-pat.rs new file mode 100644 index 000000000..ce5ae164c --- /dev/null +++ b/tests/ui/static/static-mut-not-pat.rs @@ -0,0 +1,43 @@ +// Constants (static variables) can be used to match in patterns, but mutable +// statics cannot. This ensures that there's some form of error if this is +// attempted. + +static mut a: isize = 3; + +fn main() { + // If they can't be matched against, then it's possible to capture the same + // name as a variable, hence this should be an unreachable pattern situation + // instead of spitting out a custom error about some identifier collisions + // (we should allow shadowing) + match 4 { + a => {} //~ ERROR match bindings cannot shadow statics + _ => {} + } +} + +struct NewBool(bool); +enum Direction { + North, + East, + South, + West +} +const NEW_FALSE: NewBool = NewBool(false); +struct Foo { + bar: Option<Direction>, + baz: NewBool +} + +static mut STATIC_MUT_FOO: Foo = Foo { bar: Some(Direction::West), baz: NEW_FALSE }; + +fn mutable_statics() { + match (Foo { bar: Some(Direction::North), baz: NewBool(true) }) { + Foo { bar: None, baz: NewBool(true) } => (), + STATIC_MUT_FOO => (), + //~^ ERROR match bindings cannot shadow statics + Foo { bar: Some(Direction::South), .. } => (), + Foo { bar: Some(EAST), .. } => (), + Foo { bar: Some(Direction::North), baz: NewBool(true) } => (), + Foo { bar: Some(EAST), baz: NewBool(false) } => () + } +} |