patch 8.1.0148: memory leak when using :tcl expr command commit https://github.com/vim/vim/commit/92959fa46d305ded1da433ad6d9a8d38db240c74 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Jul 4 22:12:25 2018 +0200 patch 8.1.0148: memory leak when using :tcl expr command Problem: Memory leak when using :tcl expr command. Solution: Free the result of expression evaluation. (Dominique Pelle, closes #3150)

--- a/src/if_tcl.c
+++ b/src/if_tcl.c
@@ -1385,7 +1385,10 @@ tclvimexpr(
     if (str == NULL)
 	Tcl_SetResult(interp, _("invalid expression"), TCL_STATIC);
     else
+    {
 	Tcl_SetResult(interp, str, TCL_VOLATILE);
+	vim_free(str);
+    }
     err = vimerror(interp);
 #else
     Tcl_SetResult(interp, _("expressions disabled at compile time"), TCL_STATIC);