diff options
Diffstat (limited to '')
-rw-r--r-- | src/test/ui/mismatched_types/closure-arg-count-expected-type-issue-47244.rs | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/test/ui/mismatched_types/closure-arg-count-expected-type-issue-47244.rs b/src/test/ui/mismatched_types/closure-arg-count-expected-type-issue-47244.rs new file mode 100644 index 000000000..3ddb93d12 --- /dev/null +++ b/src/test/ui/mismatched_types/closure-arg-count-expected-type-issue-47244.rs @@ -0,0 +1,20 @@ +// Regression test for #47244: in this specific scenario, when the +// expected type indicated 1 argument but the closure takes two, we +// would (early on) create type variables for the type of `b`. If the +// user then attempts to invoke a method on `b`, we would get an error +// saying that the type of `b` must be known, which was not very +// helpful. + +// run-rustfix + +use std::collections::HashMap; + +fn main() { + let mut m = HashMap::new(); + m.insert("foo", "bar"); + + let _n = m.iter().map(|_, b| { + //~^ ERROR closure is expected to take a single 2-tuple + b.to_string() + }); +} |