Code:
public class SwitchBug {
interface A { }
interface B { }
static void f(final B b) { }
public static void main(final String... args) {
f((B) switch (new Object()) {
case Object obj -> new A() {};
});
}
}
Fails compilation, with e.g. `javac --enable-preview -source 17 SwitchBug.java`
java.lang.AssertionError
at jdk.compiler/com.sun.tools.javac.util.Assert.error(Assert.java:155)
at jdk.compiler/com.sun.tools.javac.util.Assert.check(Assert.java:46)
at jdk.compiler/com.sun.tools.javac.jvm.Code$State.forceStackTop(Code.java:1776)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitYield(Gen.java:1802)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCYield.accept(JCTree.java:1658)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:610)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:645)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:631)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStats(Gen.java:682)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStats(Gen.java:666)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.handleSwitch(Gen.java:1373)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.doHandleSwitchExpression(Gen.java:1238)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitSwitchExpression(Gen.java:1202)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCSwitchExpression.accept(JCTree.java:1380)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:877)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitLetExpr(Gen.java:2381)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$LetExpr.accept(JCTree.java:3287)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:877)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitTypeCast(Gen.java:2228)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCTypeCast.accept(JCTree.java:2185)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:877)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genArgs(Gen.java:902)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitApply(Gen.java:1880)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1797)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:877)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitExec(Gen.java:1748)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1584)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:610)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:645)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:631)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStats(Gen.java:682)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitBlock(Gen.java:1097)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1091)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:610)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:645)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genMethod(Gen.java:967)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitMethodDef(Gen.java:930)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:921)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:610)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genClass(Gen.java:2420)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.genCode(JavaCompiler.java:737)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1617)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1585)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:946)
at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:317)
at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:176)
at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:64)
at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:50)
Reproduced with javac of 17.0.4, 18.0.2, 19 and current head (jdk20+8).
public class SwitchBug {
interface A { }
interface B { }
static void f(final B b) { }
public static void main(final String... args) {
f((B) switch (new Object()) {
case Object obj -> new A() {};
});
}
}
Fails compilation, with e.g. `javac --enable-preview -source 17 SwitchBug.java`
java.lang.AssertionError
at jdk.compiler/com.sun.tools.javac.util.Assert.error(Assert.java:155)
at jdk.compiler/com.sun.tools.javac.util.Assert.check(Assert.java:46)
at jdk.compiler/com.sun.tools.javac.jvm.Code$State.forceStackTop(Code.java:1776)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitYield(Gen.java:1802)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCYield.accept(JCTree.java:1658)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:610)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:645)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:631)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStats(Gen.java:682)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStats(Gen.java:666)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.handleSwitch(Gen.java:1373)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.doHandleSwitchExpression(Gen.java:1238)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitSwitchExpression(Gen.java:1202)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCSwitchExpression.accept(JCTree.java:1380)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:877)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitLetExpr(Gen.java:2381)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$LetExpr.accept(JCTree.java:3287)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:877)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitTypeCast(Gen.java:2228)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCTypeCast.accept(JCTree.java:2185)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:877)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genArgs(Gen.java:902)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitApply(Gen.java:1880)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1797)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:877)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitExec(Gen.java:1748)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1584)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:610)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:645)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:631)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStats(Gen.java:682)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitBlock(Gen.java:1097)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1091)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:610)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genStat(Gen.java:645)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genMethod(Gen.java:967)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.visitMethodDef(Gen.java:930)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:921)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genDef(Gen.java:610)
at jdk.compiler/com.sun.tools.javac.jvm.Gen.genClass(Gen.java:2420)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.genCode(JavaCompiler.java:737)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1617)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1585)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:946)
at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:317)
at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:176)
at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:64)
at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:50)
Reproduced with javac of 17.0.4, 18.0.2, 19 and current head (jdk20+8).