Add a range pattern inference failing test

src/test/ui/pattern/issue-88074-pat-range-type-inference-err.rs

@@ -0,0 +1,28 @@
+trait Zero {
+    const ZERO: Self;
+}
+
+impl Zero for String {
+    const ZERO: Self = String::new();
+}
+
+fn foo() {
+     match String::new() {
+        Zero::ZERO ..= Zero::ZERO => {},
+        //~^ ERROR only `char` and numeric types are allowed in range patterns
+        _ => {},
+    }
+}
+
+fn bar() {
+    match Zero::ZERO {
+        Zero::ZERO ..= Zero::ZERO => {},
+        //~^ ERROR type annotations needed [E0282]
+        _ => {},
+    }
+}
+
+fn main() {
+    foo();
+    bar();
+}

src/test/ui/pattern/issue-88074-pat-range-type-inference-err.stderr

@@ -0,0 +1,21 @@
+error[E0029]: only `char` and numeric types are allowed in range patterns
+  --> $DIR/issue-88074-pat-range-type-inference-err.rs:11:9
+   |
+LL |         Zero::ZERO ..= Zero::ZERO => {},
+   |         ----------^^^^^----------
+   |         |              |
+   |         |              this is of type `String` but it should be `char` or numeric
+   |         this is of type `String` but it should be `char` or numeric
+
+error[E0282]: type annotations needed
+  --> $DIR/issue-88074-pat-range-type-inference-err.rs:19:9
+   |
+LL |         Zero::ZERO ..= Zero::ZERO => {},
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type
+   |
+   = note: type must be known at this point
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0029, E0282.
+For more information about an error, try `rustc --explain E0029`.