diff options
Diffstat (limited to 'tests/ui/btreemap/btreemap-index-mut-2.stderr')
| -rw-r--r-- | tests/ui/btreemap/btreemap-index-mut-2.stderr | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/tests/ui/btreemap/btreemap-index-mut-2.stderr b/tests/ui/btreemap/btreemap-index-mut-2.stderr new file mode 100644 index 000000000..c8d4fd595 --- /dev/null +++ b/tests/ui/btreemap/btreemap-index-mut-2.stderr @@ -0,0 +1,19 @@ +error[E0594]: cannot assign to data in an index of `BTreeMap<u32, u32>` + --> $DIR/btreemap-index-mut-2.rs:6:9 + | +LL | map[&0] = 1; + | ^^^^^^^^^^^ cannot assign + | + = help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `BTreeMap<u32, u32>` +help: to modify a `BTreeMap<u32, u32>`, use `.get_mut()`, `.insert()` or the entry API + | +LL | map.insert(&0, 1); + | ~~~~~~~~ ~ + +LL | map.get_mut(&0).map(|val| { *val = 1; }); + | ~~~~~~~~~ ~~~~~~~~~~~~~~~~~~ ++++ +LL | let val = map.entry(&0).or_insert(1); + | +++++++++ ~~~~~~~ ~~~~~~~~~~~~ + + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0594`. |