7139681: Enhanced for loop: local variable scope inconsistent with JLS
Summary: For-each loop variable is incorrectly visible from the for-each expression
Reviewed-by: jjg, vromero
--- a/langtools/src/share/classes/com/sun/tools/javac/comp/Attr.java Thu Jun 06 15:30:14 2013 +0100
+++ b/langtools/src/share/classes/com/sun/tools/javac/comp/Attr.java Thu Jun 06 15:32:41 2013 +0100
@@ -1172,8 +1172,11 @@
Env<AttrContext> loopEnv =
env.dup(env.tree, env.info.dup(env.info.scope.dup()));
try {
+ //the Formal Parameter of a for-each loop is not in the scope when
+ //attributing the for-each expression; we mimick this by attributing
+ //the for-each expression first (against original scope).
+ Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv));
attribStat(tree.var, loopEnv);
- Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv));
chk.checkNonVoid(tree.pos(), exprType);
Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
if (elemtype == null) {
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/foreach/7139681/T7139681neg.java Thu Jun 06 15:32:41 2013 +0100
@@ -0,0 +1,16 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 7139681
+ * @summary Enhanced for loop: local variable scope inconsistent with JLS
+ *
+ * @compile/fail/ref=T7139681neg.out -XDrawDiagnostics T7139681neg.java
+ */
+class T7139681neg {
+ void testArray() {
+ for (int a : a) { }
+ }
+
+ void testIterable() {
+ for (Integer b : b) { }
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/foreach/7139681/T7139681neg.out Thu Jun 06 15:32:41 2013 +0100
@@ -0,0 +1,3 @@
+T7139681neg.java:10:22: compiler.err.cant.resolve.location: kindname.variable, a, , , (compiler.misc.location: kindname.class, T7139681neg, null)
+T7139681neg.java:14:26: compiler.err.cant.resolve.location: kindname.variable, b, , , (compiler.misc.location: kindname.class, T7139681neg, null)
+2 errors
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/foreach/7139681/T7139681pos.java Thu Jun 06 15:32:41 2013 +0100
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 7139681
+ * @summary Enhanced for loop: local variable scope inconsistent with JLS
+ *
+ * @compile T7139681pos.java
+ */
+class T7139681pos {
+ int[] a;
+ Iterable<Integer> b;
+
+ void testArray() {
+ for (int a : a) {
+ int a2 = a;
+ }
+ }
+
+ void testIterable() {
+ for (Integer b : b) {
+ Integer b2 = b;
+ }
+ }
+}