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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/regions/region-bounds-on-objects-and-type-parameters.rs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/src/test/ui/regions/region-bounds-on-objects-and-type-parameters.rs b/src/test/ui/regions/region-bounds-on-objects-and-type-parameters.rs new file mode 100644 index 000000000..40d2b740b --- /dev/null +++ b/src/test/ui/regions/region-bounds-on-objects-and-type-parameters.rs @@ -0,0 +1,36 @@ +// Test related to when a region bound is required to be specified. + +trait IsStatic : 'static { } +trait IsSend : Send { } +trait Is<'a> : 'a { } +trait Is2<'a> : 'a { } +trait SomeTrait { } + +// Bounds on object types: + +struct Foo<'a,'b,'c> { //~ ERROR parameter `'c` is never used + // All of these are ok, because we can derive exactly one bound: + a: Box<dyn IsStatic>, + b: Box<dyn Is<'static>>, + c: Box<dyn Is<'a>>, + d: Box<dyn IsSend>, + e: Box<dyn Is<'a>+Send>, // we can derive two bounds, but one is 'static, so ok + f: Box<dyn SomeTrait>, // OK, defaults to 'static due to RFC 599. + g: Box<dyn SomeTrait+'a>, + + z: Box<dyn Is<'a>+'b+'c>, + //~^ ERROR only a single explicit lifetime bound is permitted + //~| ERROR lifetime bound not satisfied +} + +fn test< + 'a, + 'b, + A:IsStatic, + B:Is<'a>+Is2<'b>, // OK in a parameter, but not an object type. + C:'b+Is<'a>+Is2<'b>, + D:Is<'a>+Is2<'static>, + E:'a+'b // OK in a parameter, but not an object type. +>() { } + +fn main() { } |