diff options
Diffstat (limited to '')
-rw-r--r-- | src/test/ui/cannot-mutate-captured-non-mut-var.rs | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/test/ui/cannot-mutate-captured-non-mut-var.rs b/src/test/ui/cannot-mutate-captured-non-mut-var.rs new file mode 100644 index 000000000..a83884acb --- /dev/null +++ b/src/test/ui/cannot-mutate-captured-non-mut-var.rs @@ -0,0 +1,15 @@ +#![feature(unboxed_closures)] + +use std::io::Read; + +fn to_fn_once<A,F:FnOnce<A>>(f: F) -> F { f } + +fn main() { + let x = 1; + to_fn_once(move|| { x = 2; }); + //~^ ERROR: cannot assign to `x`, as it is not declared as mutable + + let s = std::io::stdin(); + to_fn_once(move|| { s.read_to_end(&mut Vec::new()); }); + //~^ ERROR: cannot borrow `s` as mutable, as it is not declared as mutable +} |