Fix bug in matching on floating-point ranges

src/test/ui/match/match-range-fail-dominate.stderr

@@ -62,11 +62,5 @@ error: unreachable pattern
 LL |       0.02f64 => {}
    |       ^^^^^^^
 
-error: unreachable pattern
-  --> $DIR/match-range-fail-dominate.rs:47:7
-   |
-LL |       _ => {}
-   |       ^
-
-error: aborting due to 6 previous errors
+error: aborting due to 5 previous errors
 

src/test/ui/non-exhaustive/non-exhaustive-float-range-match.rs

@@ -0,0 +1,13 @@
+#![allow(illegal_floating_point_literal_pattern)]
+#![deny(unreachable_patterns)]
+
+fn main() {
+    match 0.0 {
+      0.0..=1.0 => {}
+      _ => {} // ok
+    }
+
+    match 0.0 { //~ ERROR non-exhaustive patterns
+      0.0..=1.0 => {}
+    }
+}

src/test/ui/non-exhaustive/non-exhaustive-float-range-match.stderr

@@ -0,0 +1,9 @@
+error[E0004]: non-exhaustive patterns: `_` not covered
+  --> $DIR/non-exhaustive-float-range-match.rs:10:11
+   |
+LL |     match 0.0 { //~ ERROR non-exhaustive patterns
+   |           ^^^ pattern `_` not covered
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0004`.