[java] 'yield' statement: basic highlighting (IDEA-216410)

GitOrigin-RevId: 4edae910f16a27c2a46068c2d8b6fce4674e0571

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/switchExpressions/YieldStatements.java

@@ -0,0 +1,40 @@
+class YieldStatements {
+  void m(int i) {
+    System.out.println(switch (i) {
+      case 0: yield "zero";
+      default: <error descr="Value breaks are superseded by 'yield' statements">break "many";</error>
+    });
+
+    switch (i) {
+      default: <error descr="Yield outside of switch expression">yield 0;</error>
+    }
+    System.out.println(switch (i) {
+      default:
+        Runnable r = () -> { <error descr="Yield outside of switch expression">yield 0;</error> };
+        r.run();
+        yield 0;
+    });
+    System.out.println(switch (i) {
+      default: switch (i) {
+        default: yield "0";
+      }
+    });
+
+    out: while (true) {
+      System.out.println(switch (i) {
+        case 0: <error descr="Break outside of enclosing switch expression">break;</error>
+        case 1: <error descr="Value breaks are superseded by 'yield' statements">break i;</error>
+        default: <error descr="Break outside of enclosing switch expression">break out;</error>
+      });
+    }
+
+    System.out.println(switch (i) {
+      default: yield <error descr="Expression type should not be 'void'">m(0)</error>;
+    });
+
+    int yield = i;
+    i = switch (i) {
+      default: yield yield;
+    };
+  }
+}