Add additional test cases

Author: sjwang05

tests/ui/parser/eq-gt-to-gt-eq.rs

@@ -1,27 +1,38 @@
 // Check that we try to correct `=>` to `>=` in conditions.
 
-fn foo() {
+fn main() {
     let a = 0;
     let b = 4;
     if a => b { //~ERROR
         println!("yay!");
     }
 }
 
+fn foo() {
+    let a = 0;
+    if a => 4 { //~ERROR
+        println!("yay!");
+    }
+}
+
 fn bar() {
     let a = 0;
     let b = 4;
-    if a = >b { //~ERROR
+    if a => b && true { //~ERROR
         println!("yay!");
     }
 }
 
-fn baz() {
+fn qux() {
     let a = 0;
     let b = 4;
-    if a = > b { //~ERROR
+    if true && a => b { //~ERROR
         println!("yay!");
     }
 }
 
-fn main() {}
+fn baz() {
+    let a = 0;
+    let b = 4;
+    let _ = a => b; //~ERROR
+}