[java] adds support for Java 9's improved try-with-resources (IDEA-140266)

PSI, parser, highlighting, exception analysis, control flow, completion.

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting9/TryWithResources.java

@@ -0,0 +1,45 @@
+import java.io.IOException;
+
+class TryWithResources {
+  final AutoCloseable f1 = null;
+  AutoCloseable f2 = null;
+
+  void testFields() throws Exception {
+    try (f1; <error descr="Variable used as a try-with-resources resource should be final or effectively final">f2</error>) { }
+    catch (Exception ignore) { }
+  }
+
+  void testLocalVars() throws Exception {
+    final AutoCloseable r1 = null;
+    AutoCloseable r2 = null;
+    AutoCloseable r3 = null;
+    try (r1; r2; <error descr="Variable used as a try-with-resources resource should be final or effectively final">r3</error>) { }
+    r3 = null;
+  }
+
+  void testType() throws Exception {
+    String s = "";
+    try (<error descr="Incompatible types. Found: 'java.lang.String', required: 'java.lang.AutoCloseable'">s</error>;
+         <error descr="Incompatible types. Found: 'TryWithResources', required: 'java.lang.AutoCloseable'">this</error>) { }
+  }
+
+  void testUnhandled() {
+    class Resource implements AutoCloseable {
+      @Override public void close() throws IOException { }
+    }
+    Resource r = new Resource();
+    try (<error descr="Unhandled exception from auto-closeable resource: java.io.IOException">r</error>) { }
+  }
+
+  void testResolve() throws Exception {
+    try (<error descr="Cannot resolve symbol 'r'">r</error>; AutoCloseable r = null) { }
+    try (AutoCloseable r = null; r) { }
+  }
+
+  void testUnassigned() throws Exception {
+    AutoCloseable r;
+    try (<error descr="Variable 'r' might not have been initialized">r</error>) {
+      System.out.println(r);
+    }
+  }
+}