Revert "remove unreachable ValueError (comment 2)"

This reverts commit 26eb89c.
sagemath · Sep 29, 2015 · 66759bb · 66759bb
1 parent 6d3e4f4
commit 66759bb
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/sage/rings/asymptotic/growth_group.py b/src/sage/rings/asymptotic/growth_group.py
@@ -287,6 +287,9 @@ def __init__(self, var, repr=None):
                 for v in var), tuple())
             var_repr = ', '.join(var)
         else:
+            for v in var:
+                if not isidentifier(v):
+                    raise ValueError("'%s' is not a valid name for a variable." % (v,))
             var_bases = var
             var_repr = str(repr).strip()