* Don't iterate over an hash table while modifyiong it in comp.HEADmaster

* lisp/emacs-lisp/comp.el: Don't iterate over the hash values directly
as 'comp--add-cond-cstrs-target-block' can modify the hash content.

1 files changed, 5 insertions, 1 deletions

diff --git a/lisp/emacs-lisp/comp.el b/lisp/emacs-lisp/comp.el
index f1c8f02ebc3..342212f5185 100644
--- a/lisp/emacs-lisp/comp.el
+++ b/lisp/emacs-lisp/comp.el
@@ -1974,7 +1974,11 @@ TARGET-BB-SYM is the symbol name of the target block."
 (defun comp--add-cond-cstrs-simple ()
   "`comp--add-cstrs' worker function for each selected function."
   (cl-loop
-   for b being each hash-value of (comp-func-blocks comp-func)
+   ;; Don't iterate over hash values directly as
+   ;; `comp--add-cond-cstrs-target-block' can modify the hash table
+   ;; content.
+   for b in (cl-loop for b being each hash-value of (comp-func-blocks comp-func)
+                     collect b)
    do
    (cl-loop
     named in-the-basic-block