SERVER-6704 show error message on failed "edit var" in shell

Display the JavaScript error and the line we tried to execute when we
fail to assign back to the variable in the mongo shell's edit command.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/mongo/shell/dbshell.cpp b/src/mongo/shell/dbshell.cpp
index 523d1827fb1..608c8ab77c7 100644
--- a/src/mongo/shell/dbshell.cpp
+++ b/src/mongo/shell/dbshell.cpp
@@ -589,8 +589,9 @@ static void edit( const string& whatToEdit ) {
     if ( editingVariable ) {
         // Try to execute assignment to copy edited value back into the variable
         const string code = whatToEdit + string( " = " ) + sb.str();
-        if ( !shellMainScope->exec( code, "tojs", false, false, false ) )
-            return; // Error already printed
+        if ( !shellMainScope->exec( code, "tojs", false, true, false ) ) {
+            cout << "error executing assignment: " << code << endl;
+        }
     }
     else {
         linenoisePreloadBuffer( sb.str().c_str() );