builtin-grep: allow -<n> and -[ABC]<n> notation for context lines.

diff --git a/environment.c b/environment.c
index 5d29b92bd5fe65ecad1efbec66c810cdcd523113..6df647862c60c5b76540f3038ce37f8a5dcc37c9 100644 (file)
--- a/environment.c
+++ b/environment.c
@@ -14,7 +14,7 @@ char git_default_name[MAX_GITNAME];
 int trust_executable_bit = 1;
 int assume_unchanged = 0;
 int only_use_symrefs = 0;
-int warn_ambiguous_refs = 0;
+int warn_ambiguous_refs = 1;
 int repository_format_version = 0;
 char git_commit_encoding[MAX_ENCODING_LENGTH] = "utf-8";
 int shared_repository = 0;