Don't suggest boxing an empty if/else arm

2 files changed, 25 insertions, 0 deletions

diff --git a/tests/ui/impl-trait/dont-suggest-box-on-empty-else-arm.rs b/tests/ui/impl-trait/dont-suggest-box-on-empty-else-arm.rs
new file mode 100644
index 00000000000..befd768b181
--- /dev/null
+++ b/tests/ui/impl-trait/dont-suggest-box-on-empty-else-arm.rs
@@ -0,0 +1,9 @@
+fn test() -> impl std::fmt::Debug {
+    if true {
+        "boo2"
+    } else {
+        //~^ ERROR `if` and `else` have incompatible types
+    }
+}
+
+fn main() {}
diff --git a/tests/ui/impl-trait/dont-suggest-box-on-empty-else-arm.stderr b/tests/ui/impl-trait/dont-suggest-box-on-empty-else-arm.stderr
new file mode 100644
index 00000000000..9b63911da7a
--- /dev/null
+++ b/tests/ui/impl-trait/dont-suggest-box-on-empty-else-arm.stderr
@@ -0,0 +1,16 @@
+error[E0308]: `if` and `else` have incompatible types
+  --> $DIR/dont-suggest-box-on-empty-else-arm.rs:4:12
+   |
+LL |       if true {
+   |       ------- `if` and `else` have incompatible types
+LL |           "boo2"
+   |           ------ expected because of this
+LL |       } else {
+   |  ____________^
+LL | |
+LL | |     }
+   | |_____^ expected `&str`, found `()`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0308`.