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Diffstat (limited to 'src/test/ui/hashmap/hashmap-index-mut.stderr')
| -rw-r--r-- | src/test/ui/hashmap/hashmap-index-mut.stderr | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/test/ui/hashmap/hashmap-index-mut.stderr b/src/test/ui/hashmap/hashmap-index-mut.stderr new file mode 100644 index 000000000..c1948ab62 --- /dev/null +++ b/src/test/ui/hashmap/hashmap-index-mut.stderr @@ -0,0 +1,19 @@ +error[E0594]: cannot assign to data in an index of `HashMap<u32, u32>` + --> $DIR/hashmap-index-mut.rs:5:5 + | +LL | map[&0] = 1; + | ^^^^^^^^^^^ cannot assign + | + = help: trait `IndexMut` is required to modify indexed content, but it is not implemented for `HashMap<u32, u32>` +help: to modify a `HashMap<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`. |