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-rw-r--r--lib/PublicInbox/LeiMailDiff.pm1
1 files changed, 0 insertions, 1 deletions
diff --git a/lib/PublicInbox/LeiMailDiff.pm b/lib/PublicInbox/LeiMailDiff.pm
index b21a0c36..48ba74cf 100644
--- a/lib/PublicInbox/LeiMailDiff.pm
+++ b/lib/PublicInbox/LeiMailDiff.pm
@@ -76,7 +76,6 @@ sub input_eml_cb { # used by PublicInbox::LeiInput::input_fh
 
 sub lei_mail_diff {
         my ($lei, @argv) = @_;
-        $lei->{opt}->{'in-format'} //= 'eml' if !grep(/\A[a-z0-9]+:/i, @argv);
         my $self = bless {}, __PACKAGE__;
         $self->prepare_inputs($lei, \@argv) or return;
         my $isatty = -t $lei->{1};