debugger: Handle EOF at debugger prompt correctly

Previously, pressing Ctrl+D at the debugger prompt would log an internal
error because repl() would return undefined at EOF. It looks like the code
here was actually expecting null for EOF, but we also need to explicitly
quit the debugger in the EOF case and not just return.

1 files changed, 5 insertions, 3 deletions

diff --git a/modules/script/_bootstrap/debugger.js b/modules/script/_bootstrap/debugger.js
index 6b5020fe..a61c2433 100644
--- a/modules/script/_bootstrap/debugger.js
+++ b/modules/script/_bootstrap/debugger.js
@@ -870,10 +870,12 @@ function repl() {
     var cmd;
     for (;;) {
         cmd = readline();
-        if (cmd === null)
-            return null;
-        else if (cmd === '')
+        if (cmd === null /* eof */) {
+            quitCommand();
+            return;
+        } else if (cmd === '') {
             cmd = prevcmd;
+        }
 
         try {
             prevcmd = cmd;