builtin/commit.c: extract ignore_non_trailer() helper function

diff --git a/Documentation/git-check-ref-format.txt b/Documentation/git-check-ref-format.txt
index a49be1bab49ddcdb65e4b45b578bd183a94657a5..fc02959ba4ab1ae6acc3dc5f707e870e42144f1c 100644 (file)
--- a/Documentation/git-check-ref-format.txt
+++ b/Documentation/git-check-ref-format.txt
@@ -54,6 +54,8 @@ Git imposes the following rules on how references are named:
 
 . They cannot contain a sequence `@{`.
 
+. They cannot be the single character `@`.
+
 . They cannot contain a `\`.
 
 These rules make it easy for shell script based tools to parse