Fixed parsing of '\'' at the prompt (ROOT-7159).

lib/MetaProcessor/MetaLexer.cpp

@@ -127,6 +127,9 @@ namespace cling {
                                           bool skipComments /*false*/) {
     Tok.startToken(curPos);
     while (true) {
+
+      if(*curPos == '\\')
+        curPos += 2;
       // On comment skip until the eof token.
       if (!skipComments && curPos[0] == '/' && curPos[1] == '/') {
         while (*curPos != '\0' && *curPos != '\r' && *curPos != '\n')

lib/MetaProcessor/MetaSema.cpp

@@ -89,6 +89,7 @@ namespace cling {
                                                  Value* result) {
 
     // Check if there is a function named after the file.
+    assert(!args.empty() && "Arguments must be provided (at least \"()\"");
     cling::Transaction* T = 0;
     MetaSema::ActionResult actionResult = actOnLCommand(file, &T);
     if (actionResult == AR_Success) {
@@ -120,30 +121,6 @@ namespace cling {
           << pairFuncExt.first;
         return AR_Success;
       }
-      else if (args.empty()) {
-        // No arguments passed - can we call it?
-        if (FunctionDecl* FD = dyn_cast<FunctionDecl>(ND)) {
-          // Check whether we can call it with no arguments.
-          bool canCall = true;
-          for (auto Param: FD->params()) {
-            if (!Param->hasDefaultArg()) {
-              canCall = false;
-              break;
-            }
-          }
-          if (!canCall) {
-            // FIXME: Produce clang diagnostics no viable function to call.
-            unsigned diagID
-              = Diags.getCustomDiagID (DiagnosticsEngine::Level::Warning,
-                           "function '%0' cannot be called with no arguments.");
-            //FIXME: Figure out how to pass in proper source locations, which we
-            // can use with -verify.
-            Diags.Report(noLoc, diagID)
-              << FD->getNameAsString();
-            return AR_Success;
-          }
-        } // FIXME: else no function to call!
-      }
 
       if (m_Interpreter.echo(expression, result) != Interpreter::kSuccess)
         actionResult = AR_Failure;

test/Driver/Init.C

@@ -0,0 +1,13 @@
+//------------------------------------------------------------------------------
+// CLING - the C++ LLVM-based InterpreterG :)
+//
+// This file is dual-licensed: you can choose to license it under the University
+// of Illinois Open Source License or the GNU Lesser General Public License. See
+// LICENSE.TXT for details.
+//------------------------------------------------------------------------------
+
+//RUN: cat %s | %cling 2>&1 | FileCheck %s
+
+#include <initializer_list>
+auto l {'a', 'b', '\''};
+l // CHECK: (class std::initializer_list<char> &) @0x{{.*}}

test/Driver/args.C

@@ -10,7 +10,6 @@
 //RUN: %cling '.x %s(42,"AAA)BBB")' 2>&1 | FileCheck -check-prefix=CHECK-DOTX %s
 //CHECK-NOT: {{.*error|note:.*}}
 //CHECK-DOTX-NOT: {{.*error|note:.*}}
-//CHECK: warning: function 'args' cannot be called with no arguments.
 
 extern "C" int printf(const char* fmt, ...);