diff options
Diffstat (limited to 'src/test/ui/unboxed-closures/unboxed-closures-infer-fnmut-calling-fnmut-no-mut.rs')
-rw-r--r-- | src/test/ui/unboxed-closures/unboxed-closures-infer-fnmut-calling-fnmut-no-mut.rs | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/test/ui/unboxed-closures/unboxed-closures-infer-fnmut-calling-fnmut-no-mut.rs b/src/test/ui/unboxed-closures/unboxed-closures-infer-fnmut-calling-fnmut-no-mut.rs new file mode 100644 index 000000000..6401b5e01 --- /dev/null +++ b/src/test/ui/unboxed-closures/unboxed-closures-infer-fnmut-calling-fnmut-no-mut.rs @@ -0,0 +1,20 @@ +// Test that we are able to infer a suitable kind for this closure +// that is just called (`FnMut`). + +fn main() { + let mut counter = 0; + + // Here this must be inferred to FnMut so that it can mutate counter, + // but we forgot the mut. + let tick1 = || { + counter += 1; + }; + + // In turn, tick2 must be inferred to FnMut so that it can call + // tick1, but we forgot the mut. + let tick2 = || { + tick1(); //~ ERROR cannot borrow `tick1` as mutable + }; + + tick2(); //~ ERROR cannot borrow +} |