No synthetic properties with incorrect names

compiler/frontend.java/src/org/jetbrains/kotlin/synthetic/SyntheticExtensionsScope.kt

@@ -52,6 +52,10 @@ class SyntheticExtensionsScope(storageManager: StorageManager) : JetScope by Jet
     }
 
     private fun syntheticPropertyInClassNotCached(javaClass: JavaClassDescriptor, type: JetType, name: Name): PropertyDescriptor? {
+        if (name.isSpecial()) return null
+        val firstChar = name.getIdentifier()[0]
+        if (!firstChar.isJavaIdentifierStart() || firstChar.isUpperCase()) return null
+
         val memberScope = javaClass.getMemberScope(type.getArguments())
         val getMethod = memberScope.getFunctions(toGetMethodName(name)).singleOrNull { isGoodGetMethod(it) } ?: return null
 
@@ -75,8 +79,6 @@ class SyntheticExtensionsScope(storageManager: StorageManager) : JetScope by Jet
     }
 
     override fun getSyntheticExtensionProperties(receiverType: JetType, name: Name): Collection<VariableDescriptor> {
-        if (name.isSpecial()) return emptyList()
-        if (name.getIdentifier()[0].isUpperCase()) return emptyList()
         return collectSyntheticPropertiesByName(null, receiverType.makeNotNullable(), name) ?: emptyList()
     }
 
@@ -138,7 +140,9 @@ class SyntheticExtensionsScope(storageManager: StorageManager) : JetScope by Jet
         if (methodName.isSpecial()) return null
         val identifier = methodName.getIdentifier()
         if (!identifier.startsWith("get")) return null
-        return Name.identifier(identifier.removePrefix("get").decapitalize())
+        val name = identifier.removePrefix("get").decapitalize()
+        if (!Name.isValidIdentifier(name)) return null
+        return Name.identifier(name)
     }
 
     private class MyPropertyDescriptor(

idea/idea-completion/testData/basic/multifile/IncorrectGetters/IncorrectGetters.dependency.java

@@ -0,0 +1,4 @@
+class JavaClass {
+    public int get() { return 1; }
+    public int get1() { return 1; }
+}

idea/idea-completion/testData/basic/multifile/IncorrectGetters/IncorrectGetters.kt

@@ -0,0 +1,6 @@
+fun foo(javaClass: JavaClass) {
+    javaClass.<caret>
+}
+
+// ABSENT: ""
+// ABSENT: "1"

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/MultiFileJvmBasicCompletionTestGenerated.java

@@ -131,6 +131,12 @@ public class MultiFileJvmBasicCompletionTestGenerated extends AbstractMultiFileJ
         doTest(fileName);
     }
 
+    @TestMetadata("IncorrectGetters")
+    public void testIncorrectGetters() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/basic/multifile/IncorrectGetters/");
+        doTest(fileName);
+    }
+
     @TestMetadata("JavaInnerClasses")
     public void testJavaInnerClasses() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/basic/multifile/JavaInnerClasses/");