diff options
Diffstat (limited to 'src/test/ui/mut/mut-pattern-internal-mutability.rs')
-rw-r--r-- | src/test/ui/mut/mut-pattern-internal-mutability.rs | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/test/ui/mut/mut-pattern-internal-mutability.rs b/src/test/ui/mut/mut-pattern-internal-mutability.rs new file mode 100644 index 000000000..bcee878e3 --- /dev/null +++ b/src/test/ui/mut/mut-pattern-internal-mutability.rs @@ -0,0 +1,15 @@ +fn main() { + let foo = &mut 1; + + let &mut x = foo; + x += 1; //~ ERROR cannot assign twice to immutable variable `x` + + // explicitly mut-ify internals + let &mut mut x = foo; + x += 1; + + // check borrowing is detected successfully + let &mut ref x = foo; + *foo += 1; //~ ERROR cannot assign to `*foo` because it is borrowed + drop(x); +} |