test: add a test cast for issue 6869

Author: ytmimi

tests/target/issue_6869.rs

@@ -0,0 +1,8 @@
+fn main() {
+    let x = 0.5;
+
+    match x {
+        1. .. => println!("{x} >= 1"),
+        _ => println!("{x} < 1"),
+    }
+}