From 50f0933809f2b1d46e792a6f7ca872c208dffcdc Mon Sep 17 00:00:00 2001
From: Ronny Pfannschmidt <ronny.pfannschmidt@redhat.com>
Date: Sun, 6 Dec 2020 17:12:15 +0100
Subject: fix #213: better error on nonzero dev versions

---
 src/setuptools_scm/version.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'src/setuptools_scm/version.py')

diff --git a/src/setuptools_scm/version.py b/src/setuptools_scm/version.py
index 40eadc8..f97dca5 100644
--- a/src/setuptools_scm/version.py
+++ b/src/setuptools_scm/version.py
@@ -230,7 +230,13 @@ def _bump_dev(version):
         return
 
     prefix, tail = version.rsplit(".dev", 1)
-    assert tail == "0", "own dev numbers are unsupported"
+    if tail != "0":
+        raise ValueError(
+            "choosing custom numbers for the `.devX` distance "
+            "is not supported.\n "
+            "The {version} can't be bumped\n"
+            "Please drop the tag or create a new supported one".format(version=version)
+        )
     return prefix
 
 
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