8028503: javac, for method references a primitive type can be added as a bound

Reviewed-by: jjg, dlsmith

langtools/src/share/classes/com/sun/tools/javac/comp/Attr.java

@@ -517,6 +517,10 @@ public class Attr extends JCTree.Visitor {
             return new ResultInfo(pkind, pt, newContext);
         }
 
+        protected ResultInfo dup(Type newPt, CheckContext newContext) {
+            return new ResultInfo(pkind, newPt, newContext);
+        }
+
         @Override
         public String toString() {
             if (pt != null) {
@@ -2843,7 +2847,8 @@ public class Attr extends JCTree.Visitor {
             ResultInfo checkInfo =
                     resultInfo.dup(newMethodTemplate(
                         desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
-                        that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes));
+                        that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
+                        new FunctionalReturnContext(resultInfo.checkContext));
 
             Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
 

langtools/test/tools/javac/generics/inference/T8028503/PrimitiveTypeInBoundForMethodRefTest.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2014, 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 8028503
+ * @summary javac, for method references a primitive type can be added as a bound
+ * @compile PrimitiveTypeInBoundForMethodRefTest.java
+ */
+
+class PrimitiveTypeInBoundForMethodRefTest {
+
+    interface Mapper<T, U> {
+        U map(T t);
+    }
+
+    static <U> Iterable<U> map(Mapper<String, U> mapper) {
+        return null;
+    }
+
+    static void test() {
+        Iterable<Integer> map = map(PrimitiveTypeInBoundForMethodRefTest::length);
+    }
+
+    public static <T> int length(String s) {
+        return 0;
+    }
+}

langtools/test/tools/javac/lambda/MethodReference42.out

@@ -1,4 +1,4 @@
-MethodReference42.java:38:11: compiler.err.cant.apply.symbol: kindname.method, m1, MethodReference42.SAM1, @811, kindname.class, MethodReference42, (compiler.misc.no.conforming.assignment.exists: (compiler.misc.incompatible.eq.upper.bounds: X, java.lang.String, java.lang.Number))
+MethodReference42.java:38:11: compiler.err.cant.apply.symbol: kindname.method, m1, MethodReference42.SAM1, @811, kindname.class, MethodReference42, (compiler.misc.no.conforming.assignment.exists: (compiler.misc.incompatible.ret.type.in.lambda: (compiler.misc.incompatible.eq.upper.bounds: X, java.lang.String, java.lang.Number)))
-MethodReference42.java:40:11: compiler.err.cant.apply.symbol: kindname.method, m3, MethodReference42.SAM3, @855, kindname.class, MethodReference42, (compiler.misc.no.conforming.assignment.exists: (compiler.misc.incompatible.eq.upper.bounds: X, java.lang.Object, java.lang.Number))
+MethodReference42.java:40:11: compiler.err.cant.apply.symbol: kindname.method, m3, MethodReference42.SAM3, @855, kindname.class, MethodReference42, (compiler.misc.no.conforming.assignment.exists: (compiler.misc.incompatible.ret.type.in.lambda: (compiler.misc.incompatible.eq.upper.bounds: X, java.lang.Object, java.lang.Number)))
 MethodReference42.java:41:9: compiler.err.ref.ambiguous: m4, kindname.method, m4(MethodReference42.SAM2), MethodReference42, kindname.method, m4(MethodReference42.SAM3), MethodReference42
 3 errors

langtools/test/tools/javac/lambda/MethodReference44.out

@@ -1,4 +1,4 @@
-MethodReference44.java:40:11: compiler.err.cant.apply.symbol: kindname.method, g1, MethodReference44.SAM1, @864, kindname.class, MethodReference44, (compiler.misc.no.conforming.assignment.exists: (compiler.misc.incompatible.eq.upper.bounds: X, java.lang.String, java.lang.Number))
+MethodReference44.java:40:11: compiler.err.cant.apply.symbol: kindname.method, g1, MethodReference44.SAM1, @864, kindname.class, MethodReference44, (compiler.misc.no.conforming.assignment.exists: (compiler.misc.incompatible.ret.type.in.lambda: (compiler.misc.incompatible.eq.upper.bounds: X, java.lang.String, java.lang.Number)))
-MethodReference44.java:42:11: compiler.err.cant.apply.symbol: kindname.method, g3, MethodReference44.SAM3, @932, kindname.class, MethodReference44, (compiler.misc.no.conforming.assignment.exists: (compiler.misc.incompatible.eq.upper.bounds: X, java.lang.Object, java.lang.Number))
+MethodReference44.java:42:11: compiler.err.cant.apply.symbol: kindname.method, g3, MethodReference44.SAM3, @932, kindname.class, MethodReference44, (compiler.misc.no.conforming.assignment.exists: (compiler.misc.incompatible.ret.type.in.lambda: (compiler.misc.incompatible.eq.upper.bounds: X, java.lang.Object, java.lang.Number)))
 MethodReference44.java:43:9: compiler.err.ref.ambiguous: g4, kindname.method, g4(MethodReference44.SAM2), MethodReference44, kindname.method, g4(MethodReference44.SAM3), MethodReference44
 3 errors