diff options
Diffstat (limited to 'src/test/ui/borrowck/borrowck-loan-rcvr.rs')
-rw-r--r-- | src/test/ui/borrowck/borrowck-loan-rcvr.rs | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/test/ui/borrowck/borrowck-loan-rcvr.rs b/src/test/ui/borrowck/borrowck-loan-rcvr.rs new file mode 100644 index 000000000..d2234e17a --- /dev/null +++ b/src/test/ui/borrowck/borrowck-loan-rcvr.rs @@ -0,0 +1,40 @@ +struct Point { x: isize, y: isize } + +trait Methods { + fn impurem(&self); + fn blockm<F>(&self, f: F) where F: FnOnce(); +} + +impl Methods for Point { + fn impurem(&self) { + } + + fn blockm<F>(&self, f: F) where F: FnOnce() { f() } +} + +fn a() { + let mut p = Point {x: 3, y: 4}; + + // Here: it's ok to call even though receiver is mutable, because we + // can loan it out. + p.impurem(); + + // But in this case we do not honor the loan: + p.blockm(|| { //~ ERROR cannot borrow `p` as mutable + p.x = 10; + }) +} + +fn b() { + let mut p = Point {x: 3, y: 4}; + + // Here I create an outstanding loan and check that we get conflicts: + + let l = &mut p; + p.impurem(); //~ ERROR cannot borrow + + l.x += 1; +} + +fn main() { +} |