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6638712: Inference with wildcard types causes selection of inapplicable method

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Added global sanity check in order to make sure that return type inference does not violate bounds constraints

Reviewed-by: jjg
This commit is contained in:
Maurizio Cimadamore 2009-06-16 10:46:37 +01:00
parent fda3d758e3
commit 3b51e6ae0d
17 changed files with 365 additions and 64 deletions
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15
langtools/src/share/classes/com/sun/tools/javac/code/Type.java
View File

@ -1066,6 +1066,21 @@ public class Type implements PrimitiveType {
return qtype.isErroneous();
}
/**
* Replaces this ForAll's typevars with a set of concrete Java types
* and returns the instantiated generic type. Subclasses might override
* in order to check that the list of types is a valid instantiation
* of the ForAll's typevars.
*
* @param actuals list of actual types
* @param types types instance
* @return qtype where all occurrences of tvars are replaced
* by types in actuals
*/
public Type inst(List<Type> actuals, Types types) {
return types.subst(qtype, tvars, actuals);
}
public Type map(Mapping f) {
return f.apply(qtype);
}

16
langtools/src/share/classes/com/sun/tools/javac/code/Types.java
View File

@ -343,6 +343,14 @@ public class Types {
if (s.tag >= firstPartialTag)
return isSuperType(s, t);
if (s.isCompound()) {
for (Type s2 : interfaces(s).prepend(supertype(s))) {
if (!isSubtype(t, s2, capture))
return false;
}
return true;
}
Type lower = lowerBound(s);
if (s != lower)
return isSubtype(capture ? capture(t) : t, lower, false);
@ -2870,6 +2878,14 @@ public class Types {
/**
* Capture conversion as specified by JLS 3rd Ed.
*/
public List<Type> capture(List<Type> ts) {
List<Type> buf = List.nil();
for (Type t : ts) {
buf = buf.prepend(capture(t));
}
return buf.reverse();
}
public Type capture(Type t) {
if (t.tag != CLASS)
return t;

4
langtools/src/share/classes/com/sun/tools/javac/comp/Check.java
View File

@ -391,6 +391,10 @@ public class Check {
diags.fragment("incompatible.types" + (d!=null ? ".1" : ""), d),
t, pt);
}
} catch (Infer.InvalidInstanceException ex) {
JCDiagnostic d = ex.getDiagnostic();
log.error(pos, "invalid.inferred.types", t.tvars, d);
return types.createErrorType(pt);
}
}
}

160
langtools/src/share/classes/com/sun/tools/javac/comp/Infer.java
View File

@ -29,6 +29,7 @@ import com.sun.tools.javac.util.*;
import com.sun.tools.javac.util.List;
import com.sun.tools.javac.code.*;
import com.sun.tools.javac.code.Type.*;
import com.sun.tools.javac.code.Symbol.*;
import com.sun.tools.javac.util.JCDiagnostic;
import static com.sun.tools.javac.code.TypeTags.*;
@ -49,6 +50,7 @@ public class Infer {
Symtab syms;
Types types;
Resolve rs;
JCDiagnostic.Factory diags;
public static Infer instance(Context context) {
@ -62,48 +64,60 @@ public class Infer {
context.put(inferKey, this);
syms = Symtab.instance(context);
types = Types.instance(context);
rs = Resolve.instance(context);
diags = JCDiagnostic.Factory.instance(context);
ambiguousNoInstanceException =
new NoInstanceException(true, diags);
unambiguousNoInstanceException =
new NoInstanceException(false, diags);
invalidInstanceException =
new InvalidInstanceException(diags);
}
public static class NoInstanceException extends RuntimeException {
public static class InferenceException extends RuntimeException {
private static final long serialVersionUID = 0;
boolean isAmbiguous; // exist several incomparable best instances?
JCDiagnostic diagnostic;
JCDiagnostic.Factory diags;
NoInstanceException(boolean isAmbiguous, JCDiagnostic.Factory diags) {
InferenceException(JCDiagnostic.Factory diags) {
this.diagnostic = null;
this.isAmbiguous = isAmbiguous;
this.diags = diags;
}
NoInstanceException setMessage(String key) {
this.diagnostic = diags.fragment(key);
return this;
}
NoInstanceException setMessage(String key, Object arg1) {
this.diagnostic = diags.fragment(key, arg1);
return this;
}
NoInstanceException setMessage(String key, Object arg1, Object arg2) {
this.diagnostic = diags.fragment(key, arg1, arg2);
return this;
}
NoInstanceException setMessage(String key, Object arg1, Object arg2, Object arg3) {
this.diagnostic = diags.fragment(key, arg1, arg2, arg3);
InferenceException setMessage(String key, Object... args) {
this.diagnostic = diags.fragment(key, args);
return this;
}
public JCDiagnostic getDiagnostic() {
return diagnostic;
return diagnostic;
}
}
public static class NoInstanceException extends InferenceException {
private static final long serialVersionUID = 1;
boolean isAmbiguous; // exist several incomparable best instances?
NoInstanceException(boolean isAmbiguous, JCDiagnostic.Factory diags) {
super(diags);
this.isAmbiguous = isAmbiguous;
}
}
public static class InvalidInstanceException extends InferenceException {
private static final long serialVersionUID = 2;
InvalidInstanceException(JCDiagnostic.Factory diags) {
super(diags);
}
}
private final NoInstanceException ambiguousNoInstanceException;
private final NoInstanceException unambiguousNoInstanceException;
private final InvalidInstanceException invalidInstanceException;
/***************************************************************************
* Auxiliary type values and classes
@ -233,7 +247,7 @@ public class Infer {
*/
public Type instantiateExpr(ForAll that,
Type to,
Warner warn) throws NoInstanceException {
Warner warn) throws InferenceException {
List<Type> undetvars = Type.map(that.tvars, fromTypeVarFun);
for (List<Type> l = undetvars; l.nonEmpty(); l = l.tail) {
UndetVar v = (UndetVar) l.head;
@ -259,8 +273,7 @@ public class Infer {
List<Type> targs = Type.map(undetvars, getInstFun);
targs = types.subst(targs, that.tvars, targs);
checkWithinBounds(that.tvars, targs, warn);
return getInstFun.apply(qtype1);
return that.inst(targs, types);
}
/** Instantiate method type `mt' by finding instantiations of
@ -268,36 +281,42 @@ public class Infer {
*/
public Type instantiateMethod(List<Type> tvars,
MethodType mt,
List<Type> argtypes,
boolean allowBoxing,
boolean useVarargs,
Warner warn) throws NoInstanceException {
final List<Type> argtypes,
final boolean allowBoxing,
final boolean useVarargs,
final Warner warn) throws InferenceException {
//-System.err.println("instantiateMethod(" + tvars + ", " + mt + ", " + argtypes + ")"); //DEBUG
List<Type> undetvars = Type.map(tvars, fromTypeVarFun);
List<Type> formals = mt.argtypes;
//need to capture exactly once - otherwise subsequent
//applicability checks might fail
final List<Type> capturedArgs = types.capture(argtypes);
List<Type> actuals = capturedArgs;
List<Type> actualsNoCapture = argtypes;
// instantiate all polymorphic argument types and
// set up lower bounds constraints for undetvars
Type varargsFormal = useVarargs ? formals.last() : null;
while (argtypes.nonEmpty() && formals.head != varargsFormal) {
Type ft = formals.head;
Type at = argtypes.head.baseType();
if (at.tag == FORALL)
at = instantiateArg((ForAll) at, ft, tvars, warn);
Type sft = types.subst(ft, tvars, undetvars);
while (actuals.nonEmpty() && formals.head != varargsFormal) {
Type formal = formals.head;
Type actual = actuals.head.baseType();
Type actualNoCapture = actualsNoCapture.head.baseType();
if (actual.tag == FORALL)
actual = instantiateArg((ForAll)actual, formal, tvars, warn);
Type undetFormal = types.subst(formal, tvars, undetvars);
boolean works = allowBoxing
? types.isConvertible(at, sft, warn)
: types.isSubtypeUnchecked(at, sft, warn);
? types.isConvertible(actual, undetFormal, warn)
: types.isSubtypeUnchecked(actual, undetFormal, warn);
if (!works) {
throw unambiguousNoInstanceException
.setMessage("no.conforming.assignment.exists",
tvars, at, ft);
tvars, actualNoCapture, formal);
}
formals = formals.tail;
argtypes = argtypes.tail;
actuals = actuals.tail;
actualsNoCapture = actualsNoCapture.tail;
}
if (formals.head != varargsFormal || // not enough args
!useVarargs && argtypes.nonEmpty()) { // too many args
!useVarargs && actuals.nonEmpty()) { // too many args
// argument lists differ in length
throw unambiguousNoInstanceException
.setMessage("arg.length.mismatch");
@ -305,20 +324,21 @@ public class Infer {
// for varargs arguments as well
if (useVarargs) {
Type elt = types.elemtype(varargsFormal);
Type sft = types.subst(elt, tvars, undetvars);
while (argtypes.nonEmpty()) {
Type ft = sft;
Type at = argtypes.head.baseType();
if (at.tag == FORALL)
at = instantiateArg((ForAll) at, ft, tvars, warn);
boolean works = types.isConvertible(at, sft, warn);
Type elemType = types.elemtype(varargsFormal);
Type elemUndet = types.subst(elemType, tvars, undetvars);
while (actuals.nonEmpty()) {
Type actual = actuals.head.baseType();
Type actualNoCapture = actualsNoCapture.head.baseType();
if (actual.tag == FORALL)
actual = instantiateArg((ForAll)actual, elemType, tvars, warn);
boolean works = types.isConvertible(actual, elemUndet, warn);
if (!works) {
throw unambiguousNoInstanceException
.setMessage("no.conforming.assignment.exists",
tvars, at, ft);
tvars, actualNoCapture, elemType);
}
argtypes = argtypes.tail;
actuals = actuals.tail;
actualsNoCapture = actualsNoCapture.tail;
}
}
@ -349,16 +369,38 @@ public class Infer {
}
checkWithinBounds(tvars, undettypes.toList(), warn);
mt = (MethodType)types.subst(mt, tvars, insttypes.toList());
if (!restvars.isEmpty()) {
// if there are uninstantiated variables,
// quantify result type with them
mt = new MethodType(mt.argtypes,
new ForAll(restvars.toList(), mt.restype),
mt.thrown, syms.methodClass);
final List<Type> inferredTypes = insttypes.toList();
final List<Type> all_tvars = tvars; //this is the wrong tvars
final MethodType mt2 = new MethodType(mt.argtypes, null, mt.thrown, syms.methodClass);
mt2.restype = new ForAll(restvars.toList(), mt.restype) {
@Override
public Type inst(List<Type> inferred, Types types) throws NoInstanceException {
List<Type> formals = types.subst(mt2.argtypes, tvars, inferred);
if (!rs.argumentsAcceptable(capturedArgs, formals,
allowBoxing, useVarargs, warn)) {
// inferred method is not applicable
throw invalidInstanceException.setMessage("inferred.do.not.conform.to.params", formals, argtypes);
}
// check that inferred bounds conform to their bounds
checkWithinBounds(all_tvars,
types.subst(inferredTypes, tvars, inferred), warn);
return super.inst(inferred, types);
}};
return mt2;
}
else if (!rs.argumentsAcceptable(capturedArgs, mt.getParameterTypes(), allowBoxing, useVarargs, warn)) {
// inferred method is not applicable
throw invalidInstanceException.setMessage("inferred.do.not.conform.to.params", mt.getParameterTypes(), argtypes);
}
else {
// return instantiated version of method type
return mt;
}
// return instantiated version of method type
return types.subst(mt, tvars, insttypes.toList());
}
//where
@ -370,7 +412,7 @@ public class Infer {
private Type instantiateArg(ForAll that,
Type to,
List<Type> tvars,
Warner warn) throws NoInstanceException {
Warner warn) throws InferenceException {
List<Type> targs;
try {
return instantiateExpr(that, to, warn);
@ -387,16 +429,16 @@ public class Infer {
private void checkWithinBounds(List<Type> tvars,
List<Type> arguments,
Warner warn)
throws NoInstanceException {
throws InvalidInstanceException {
for (List<Type> tvs = tvars, args = arguments;
tvs.nonEmpty();
tvs = tvs.tail, args = args.tail) {
if (args.head instanceof UndetVar) continue;
List<Type> bounds = types.subst(types.getBounds((TypeVar)tvs.head), tvars, arguments);
if (!types.isSubtypeUnchecked(args.head, bounds, warn))
throw unambiguousNoInstanceException
throw invalidInstanceException
.setMessage("inferred.do.not.conform.to.bounds",
arguments, tvars);
args.head, bounds);
}
}
}

6
langtools/src/share/classes/com/sun/tools/javac/comp/Resolve.java
View File

@ -299,7 +299,7 @@ public class Resolve {
boolean allowBoxing,
boolean useVarargs,
Warner warn)
throws Infer.NoInstanceException {
throws Infer.InferenceException {
if (useVarargs && (m.flags() & VARARGS) == 0) return null;
Type mt = types.memberType(site, m);
@ -370,7 +370,7 @@ public class Resolve {
try {
return rawInstantiate(env, site, m, argtypes, typeargtypes,
allowBoxing, useVarargs, warn);
} catch (Infer.NoInstanceException ex) {
} catch (Infer.InferenceException ex) {
return null;
}
}
@ -584,7 +584,7 @@ public class Resolve {
default: return bestSoFar;
}
}
} catch (Infer.NoInstanceException ex) {
} catch (Infer.InferenceException ex) {
switch (bestSoFar.kind) {
case ABSENT_MTH:
return wrongMethod.setWrongSym(sym, ex.getDiagnostic());

12
langtools/src/share/classes/com/sun/tools/javac/resources/compiler.properties
View File

@ -84,7 +84,7 @@ compiler.err.cant.apply.symbol=\
{0} {1} in {4} {5} cannot be applied to given types\n\
required: {2}\n\
found: {3}
compiler.err.cant.apply.symbol.1=\
compiler.err.cant.apply.symbol.1=\
{0} {1} in {4} {5} cannot be applied to given types;\n\
required: {2}\n\
found: {3}\n\
@ -469,6 +469,8 @@ compiler.err.undetermined.type=\
type parameters of {0} cannot be determined
compiler.err.undetermined.type.1=\
type parameters of {0} cannot be determined; {1}
compiler.err.invalid.inferred.types=\
invalid inferred types for {0}; {1}
compiler.err.unreachable.stmt=\
unreachable statement
compiler.err.initializer.must.be.able.to.complete.normally=\
@ -995,7 +997,13 @@ compiler.misc.no.conforming.assignment.exists=\
compiler.misc.arg.length.mismatch=\
cannot instantiate from arguments because actual and formal argument lists differ in length
compiler.misc.inferred.do.not.conform.to.bounds=\
inferred type argument(s) {0} do not conform to bounds of type variable(s) {1}
inferred type does not conform to declared bound(s)\n\
inferred: {0}\n\
bound(s): {1}
compiler.misc.inferred.do.not.conform.to.params=\
actual arguments do not conforms to inferred formal arguments\n\
required: {0}\n\
found: {1}
#####

1
langtools/test/tools/javac/generics/inference/6302954/T6476073.java
View File

@ -25,6 +25,7 @@
* @test
* @bug 6476073
* @summary Capture using super wildcard of type variables doesn't work
* @ignore awaiting for 6650759 (see bug report for a detailed evaluation)
* @compile T6476073.java
*/

41
langtools/test/tools/javac/generics/inference/6638712/T6638712a.java Normal file
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@ -0,0 +1,41 @@
/*
* Copyright 2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
/*
* @test
* @bug 6638712
* @author mcimadamore
* @summary Inference with wildcard types causes selection of inapplicable method
* @compile/fail/ref=T6638712a.out -XDrawDiagnostics T6638712a.java
*/
import java.util.*;
class T6638712a {
<T> Comparator<T> compound(Iterable<? extends Comparator<? super T>> it) {}
public void test(List<Comparator<?>> x) {
Comparator<String> c3 = compound(x);
}
}

2
langtools/test/tools/javac/generics/inference/6638712/T6638712a.out Normal file
View File

@ -0,0 +1,2 @@
T6638712a.java:39:41: compiler.err.invalid.inferred.types: T, (compiler.misc.inferred.do.not.conform.to.params: java.lang.Iterable<? extends java.util.Comparator<? super java.lang.String>>, java.util.List<java.util.Comparator<?>>)
1 error

39
langtools/test/tools/javac/generics/inference/6638712/T6638712b.java Normal file
View File

@ -0,0 +1,39 @@
/*
* Copyright 2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
/*
* @test
* @bug 6638712
* @author mcimadamore
* @summary Inference with wildcard types causes selection of inapplicable method
* @compile/fail/ref=T6638712b.out -XDrawDiagnostics T6638712b.java
*/
class T6638712b<X> {
<I extends T6638712b<T>, T> T m(I test) { return null; }
void test(T6638712b<Integer> x) {
String i = m(x);
}
}

2
langtools/test/tools/javac/generics/inference/6638712/T6638712b.out Normal file
View File

@ -0,0 +1,2 @@
T6638712b.java:37:21: compiler.err.invalid.inferred.types: T, (compiler.misc.inferred.do.not.conform.to.bounds: T6638712b<java.lang.Integer>, T6638712b<java.lang.String>)
1 error

41
langtools/test/tools/javac/generics/inference/6638712/T6638712c.java Normal file
View File

@ -0,0 +1,41 @@
/*
* Copyright 2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
/*
* @test
* @bug 6638712 6707034
* @author mcimadamore
* @summary Inference with wildcard types causes selection of inapplicable method
* @compile/fail/ref=T6638712c.out -XDrawDiagnostics T6638712c.java
*/
import java.util.*;
class T6638712c {
<T> T sort(T[] a, Comparator<? super T> c) { return null; }
void test(Enum[] e, Comparator<Enum<?>> comp) {
sort(e, comp);
}
}

2
langtools/test/tools/javac/generics/inference/6638712/T6638712c.out Normal file
View File

@ -0,0 +1,2 @@
T6638712c.java:39:9: compiler.err.cant.apply.symbol: kindname.method, sort, T[],java.util.Comparator<? super T>, java.lang.Enum[],java.util.Comparator<java.lang.Enum<?>>, kindname.class, T6638712c, null
1 error

41
langtools/test/tools/javac/generics/inference/6638712/T6638712d.java Normal file
View File

@ -0,0 +1,41 @@
/*
* Copyright 2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
/*
* @test
* @bug 6638712 6730468
* @author mcimadamore
* @summary Inference with wildcard types causes selection of inapplicable method
* @compile/fail/ref=T6638712d.out -XDrawDiagnostics T6638712d.java
*/
import java.util.*;
public class T6638712d {
<U> U m(U u, List<List<U>> list) { return null; }
void test(List<List<String>> lls) {
m(1, lls);
}
}

2
langtools/test/tools/javac/generics/inference/6638712/T6638712d.out Normal file
View File

@ -0,0 +1,2 @@
T6638712d.java:39:9: compiler.err.cant.apply.symbol: kindname.method, m, U,java.util.List<java.util.List<U>>, int,java.util.List<java.util.List<java.lang.String>>, kindname.class, T6638712d, null
1 error

43
langtools/test/tools/javac/generics/inference/6638712/T6638712e.java Normal file
View File

@ -0,0 +1,43 @@
/*
* Copyright 2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
/*
* @test
* @bug 6638712 6795689
* @author mcimadamore
* @summary Inference with wildcard types causes selection of inapplicable method
* @compile/fail/ref=T6638712e.out -XDrawDiagnostics T6638712e.java
*/
class T6638712e {
static class Foo<A, B> {
<X> Foo<X, B> m(Foo<? super X, ? extends A> foo) { return null;}
}
static class Test {
Foo<Object, String> test(Foo<Boolean, String> foo1, Foo<Boolean, Boolean> foo2) {
return foo1.m(foo2);
}
}
}

2
langtools/test/tools/javac/generics/inference/6638712/T6638712e.out Normal file
View File

@ -0,0 +1,2 @@
T6638712e.java:40:27: compiler.err.invalid.inferred.types: X, (compiler.misc.inferred.do.not.conform.to.params: T6638712e.Foo<? super java.lang.Object,? extends java.lang.Boolean>, T6638712e.Foo<java.lang.Boolean,java.lang.Boolean>)
1 error