EA-38865 Fail for convention functions names

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetPsiUtil.java

@@ -21,13 +21,16 @@ import com.intellij.openapi.util.text.StringUtil;
 import com.intellij.psi.PsiElement;
 import com.intellij.psi.impl.CheckUtil;
 import com.intellij.psi.impl.source.codeStyle.CodeEditUtil;
+import com.intellij.psi.tree.IElementType;
 import com.intellij.psi.util.PsiTreeUtil;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.lang.resolve.ImportPath;
 import org.jetbrains.jet.lang.resolve.name.FqName;
 import org.jetbrains.jet.lang.resolve.name.Name;
+import org.jetbrains.jet.lang.types.expressions.OperatorConventions;
 import org.jetbrains.jet.lang.types.lang.JetStandardClasses;
+import org.jetbrains.jet.lexer.JetToken;
 import org.jetbrains.jet.lexer.JetTokens;
 
 import java.util.Collection;
@@ -353,6 +356,24 @@ public class JetPsiUtil {
         return !(multiDeclarationEntry.getParent().getParent() instanceof JetForExpression);
     }
 
+    @Nullable
+    public static Name getConventionName(@NotNull JetSimpleNameExpression simpleNameExpression) {
+        if (simpleNameExpression.getIdentifier() != null) {
+            return simpleNameExpression.getReferencedNameAsName();
+        }
+
+        PsiElement firstChild = simpleNameExpression.getFirstChild();
+        if (firstChild != null) {
+            IElementType elementType = firstChild.getNode().getElementType();
+            if (elementType instanceof JetToken) {
+                JetToken jetToken = (JetToken) elementType;
+                return OperatorConventions.getNameForOperationSymbol(jetToken);
+            }
+        }
+
+        return null;
+    }
+
     public static PsiElement getTopmostParentOfTypes(@Nullable PsiElement element, @NotNull Class<? extends PsiElement>... parentTypes) {
         if (element == null) {
             return null;

compiler/frontend/src/org/jetbrains/jet/lang/resolve/name/Name.java

@@ -26,7 +26,7 @@ public class Name implements Comparable<Name> {
     private final String name;
     private final boolean special;
 
-    private Name(String name, boolean special) {
+    private Name(@NotNull String name, boolean special) {
         this.name = name;
         this.special = special;
     }