1 files changed, 14 insertions, 0 deletions
diff --git a/generic/tclEnsemble.c b/generic/tclEnsemble.c
index 058590a..88de9f3 100644
--- a/generic/tclEnsemble.c
+++ b/generic/tclEnsemble.c
@@ -3056,6 +3056,9 @@ CompileToCompiledCommand(
     Tcl_Parse synthetic;
     Tcl_Token *tokenPtr;
     int result, i;
+    int savedNumCmds = envPtr->numCommands;
+    int savedStackDepth = envPtr->currStackDepth;
+    unsigned savedCodeNext = envPtr->codeNext - envPtr->codeStart;
 
     if (cmdPtr->compileProc == NULL) {
 	return TCL_ERROR;
@@ -3110,6 +3113,17 @@ CompileToCompiledCommand(
     result = cmdPtr->compileProc(interp, &synthetic, cmdPtr, envPtr);
 
     /*
+     * If our target fails to compile, revert the number of commands and the
+     * pointer to the place to issue the next instruction. [Bug 3600328]
+     */
+
+    if (result != TCL_OK) {
+	envPtr->numCommands = savedNumCmds;
+	envPtr->currStackDepth = savedStackDepth;
+	envPtr->codeNext = envPtr->codeStart + savedCodeNext;
+    }
+
+    /*
      * Clean up if necessary.
      */