IDEA-226284 Warn about unqualified 'yield' method usage

GitOrigin-RevId: ec260801f8968d0f70f919cf4104fd2c9a3498ed

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting8/Underscore.java

@@ -1,3 +1,3 @@
 class Test {
-  void <warning descr="Use of '_' as an identifier might not be supported in releases after Java 8">_</warning>(){}
+  void <warning descr="Use of '_' as an identifier is not supported in releases after Java 8">_</warning>(){}
 }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting8/UnqualifiedYield.java

@@ -0,0 +1,24 @@
+class Yield {
+  class X {
+    void test() {
+      <warning descr="Unqualified call of 'yield' method might not be supported in releases after Java 13">yield</warning>("x");
+      <warning descr="Unqualified call of 'yield' method might not be supported in releases after Java 13">yield</warning>(1);
+    }
+  }
+
+  void test() {
+    <warning descr="Unqualified call of 'yield' method might not be supported in releases after Java 13">yield</warning>("x");
+    <warning descr="Unqualified call of 'yield' method might not be supported in releases after Java 13">yield</warning>(1);
+  }
+  
+  void varYield() {
+    int yield = 5;
+    yield++;
+    yield = 7;
+  }
+
+  void yield(int x) {}
+
+  static void yield(String x) {
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting8/VarClassesWarning.java

@@ -1 +1 @@
-class <warning descr="Usage of 'var' as class name might not be supported in releases after Java 9">var</warning> {}
+class <warning descr="Usage of 'var' as class name is not supported in releases after Java 9">var</warning> {}