KT-1054 comparison of booleans

compiler/backend/src/org/jetbrains/jet/codegen/ExpressionCodegen.java

@@ -1690,7 +1690,7 @@ public class ExpressionCodegen extends JetVisitor<StackValue, StackValue> {
     }
 
     public StackValue generateEqualsForExpressionsOnStack(IElementType opToken, Type leftType, Type rightType, boolean leftNullable, boolean rightNullable) {
-        if (isNumberPrimitive(leftType) && leftType == rightType) {
+        if ((isNumberPrimitive(leftType) || leftType.getSort() == Type.BOOLEAN) && leftType == rightType) {
             return compareExpressionsOnStack(opToken, leftType);
         }
         else {

compiler/testData/codegen/regressions/kt1054.kt

@@ -0,0 +1,17 @@
+fun box() : String {
+  return if(true.and(true)) "OK" else "fail"
+}
+
+fun Boolean.and(other : Boolean) : Boolean{
+  if(other == true)  {
+    if(this == true){
+      return true ;
+     }
+    else{
+      return false;
+    }
+  }
+  else {
+    return false;
+  }
+}

compiler/tests/org/jetbrains/jet/codegen/PrimitiveTypesTest.java

@@ -395,4 +395,8 @@ public class PrimitiveTypesTest extends CodegenTestCase {
     public void testKt1055 () {
         blackBoxFile("regressions/kt1055.kt");
     }
+
+    public void testKt1054 () {
+        blackBoxFile("regressions/kt1054.kt");
+    }
 }