# HG changeset patch
# User mcimadamore
# Date 1511540073 0
# Node ID 6373d9a0ad825732b48450e014e91c27fba84918
# Parent  19122c10fc5285863014432f75790c2a74ef439f
8191834: Assigning a void expression to a "var" crashes the compiler
Summary: local variable type inference should give error on void initializers
Reviewed-by: sundar

diff -r 19122c10fc52 -r 6373d9a0ad82 src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Check.java
--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Check.java	Fri Nov 24 09:45:39 2017 +0100
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Check.java	Fri Nov 24 16:14:33 2017 +0000
@@ -952,6 +952,9 @@
         if (t.hasTag(BOT)) {
             log.error(pos, Errors.CantInferLocalVarType(name, Fragments.LocalCantInferNull));
             return types.createErrorType(t);
+        } else if (t.hasTag(VOID)) {
+            log.error(pos, Errors.CantInferLocalVarType(name, Fragments.LocalCantInferVoid));
+            return types.createErrorType(t);
         }
         return t;
     }
diff -r 19122c10fc52 -r 6373d9a0ad82 src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties
--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties	Fri Nov 24 09:45:39 2017 +0100
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties	Fri Nov 24 16:14:33 2017 +0000
@@ -1216,6 +1216,9 @@
 compiler.misc.local.cant.infer.null=\
     variable initializer is ''null''
 
+compiler.misc.local.cant.infer.void=\
+    variable initializer is ''void''
+
 compiler.misc.local.missing.init=\
     cannot use ''var'' on variable without initializer
 
diff -r 19122c10fc52 -r 6373d9a0ad82 test/langtools/tools/javac/diags/examples/LocalCantInferVoid.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/diags/examples/LocalCantInferVoid.java	Fri Nov 24 16:14:33 2017 +0000
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2017, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+
+// key: compiler.err.cant.infer.local.var.type
+// key: compiler.misc.local.cant.infer.void
+
+class LocalCantInferVoid {
+    void test() {
+        var s = test();
+    }
+}
diff -r 19122c10fc52 -r 6373d9a0ad82 test/langtools/tools/javac/lvti/BadLocalVarInferenceTest.java
--- a/test/langtools/tools/javac/lvti/BadLocalVarInferenceTest.java	Fri Nov 24 09:45:39 2017 +0100
+++ b/test/langtools/tools/javac/lvti/BadLocalVarInferenceTest.java	Fri Nov 24 16:14:33 2017 +0000
@@ -1,6 +1,6 @@
 /*
  * @test /nodynamiccopyright/
- * @bug 8177466
+ * @bug 8177466 8191834
  * @summary Add compiler support for local variable type-inference
  * @compile/fail/ref=BadLocalVarInferenceTest.out -XDrawDiagnostics BadLocalVarInferenceTest.java
  */
@@ -27,7 +27,10 @@
             void m(String s) { }
         };
         var s = f(x -> { x.charAt(0); }); //LHS was String
+        var t = m(); //void
     }
 
     <Z> Z f(Supplier<Z> sz) { return null; }
+
+    void m() { }
 }
diff -r 19122c10fc52 -r 6373d9a0ad82 test/langtools/tools/javac/lvti/BadLocalVarInferenceTest.out
--- a/test/langtools/tools/javac/lvti/BadLocalVarInferenceTest.out	Fri Nov 24 09:45:39 2017 +0100
+++ b/test/langtools/tools/javac/lvti/BadLocalVarInferenceTest.out	Fri Nov 24 16:14:33 2017 +0000
@@ -7,4 +7,5 @@
 BadLocalVarInferenceTest.java:25:29: compiler.err.does.not.override.abstract: compiler.misc.anonymous.class: BadLocalVarInferenceTest$1, m(java.lang.Object), BadLocalVarInferenceTest.Foo
 BadLocalVarInferenceTest.java:26:13: compiler.err.method.does.not.override.superclass
 BadLocalVarInferenceTest.java:29:27: compiler.err.cant.resolve.location.args: kindname.method, charAt, , int, (compiler.misc.location.1: kindname.variable, x, java.lang.Object)
-9 errors
+BadLocalVarInferenceTest.java:30:13: compiler.err.cant.infer.local.var.type: t, (compiler.misc.local.cant.infer.void)
+10 errors