1 files changed, 31 insertions, 0 deletions
diff --git a/src/test/ui/suggestions/suggest-tryinto-edition-change.rs b/src/test/ui/suggestions/suggest-tryinto-edition-change.rs
new file mode 100644
index 000000000..f03b42bbe
--- /dev/null
+++ b/src/test/ui/suggestions/suggest-tryinto-edition-change.rs
@@ -0,0 +1,31 @@
+// Make sure that trying to access `TryInto`, `TryFrom`, `FromIterator` in pre-2021 mentions
+// Edition 2021 change
+// edition:2018
+
+fn test() {
+    let _i: i16 = 0_i32.try_into().unwrap();
+    //~^ ERROR no method named `try_into` found for type `i32` in the current scope
+    //~| NOTE method not found in `i32`
+    //~| NOTE 'std::convert::TryInto' is included in the prelude starting in Edition 2021
+
+    let _i: i16 = TryFrom::try_from(0_i32).unwrap();
+    //~^ ERROR failed to resolve: use of undeclared type
+    //~| NOTE not found in this scope
+    //~| NOTE 'std::convert::TryFrom' is included in the prelude starting in Edition 2021
+    //~| NOTE 'core::convert::TryFrom' is included in the prelude starting in Edition 2021
+
+    let _i: i16 = TryInto::try_into(0_i32).unwrap();
+    //~^ ERROR failed to resolve: use of undeclared type
+    //~| NOTE not found in this scope
+    //~| NOTE 'std::convert::TryInto' is included in the prelude starting in Edition 2021
+    //~| NOTE 'core::convert::TryInto' is included in the prelude starting in Edition 2021
+
+    let _v: Vec<_> = FromIterator::from_iter(&[1]);
+    //~^ ERROR failed to resolve: use of undeclared type
+    //~| NOTE 'std::iter::FromIterator' is included in the prelude starting in Edition 2021
+    //~| NOTE 'core::iter::FromIterator' is included in the prelude starting in Edition 2021
+}
+
+fn main() {
+    test();
+}