1 files changed, 50 insertions, 0 deletions
diff --git a/tests/ui/resolve/issue-100365.rs b/tests/ui/resolve/issue-100365.rs
new file mode 100644
index 00000000000..1d883503606
--- /dev/null
+++ b/tests/ui/resolve/issue-100365.rs
@@ -0,0 +1,50 @@
+fn main() {
+    let addr = Into::<std::net::IpAddr>.into([127, 0, 0, 1]);
+    //~^ ERROR expected value, found trait `Into`
+    //~| HELP use the path separator
+
+    let _ = Into.into(());
+    //~^ ERROR expected value, found trait `Into`
+    //~| HELP use the path separator
+
+    let _ = Into::<()>.into;
+    //~^ ERROR expected value, found trait `Into`
+    //~| HELP use the path separator
+}
+
+macro_rules! Trait {
+    () => {
+        ::std::iter::Iterator
+        //~^ ERROR expected value, found trait `std::iter::Iterator`
+        //~| ERROR expected value, found trait `std::iter::Iterator`
+    };
+}
+
+macro_rules! create {
+    () => {
+        Into::<String>.into("")
+        //~^ ERROR expected value, found trait `Into`
+        //~| HELP use the path separator
+    };
+}
+
+fn interaction_with_macros() {
+    //
+    // Note that if the receiver is a macro call, we do not want to suggest to replace
+    // `.` with `::` as that would be a syntax error.
+    // Since the receiver is a trait and not a type, we cannot suggest to surround
+    // it with angle brackets. It would be interpreted as a trait object type void of
+    // `dyn` which is most likely not what the user intended to write.
+    // `<_ as Trait!()>::` is also not an option as it's equally syntactically invalid.
+    //
+
+    Trait!().map(std::convert::identity); // no `help` here!
+
+    Trait!().map; // no `help` here!
+
+    //
+    // Ensure that the suggestion is shown for expressions inside of macro definitions.
+    //
+
+    let _ = create!();
+}