git check-ignore returns included files

Hello,

Is it expected for check-ignore to output included files (using a "!" prefix)?

Steps to reproduce:

    git init foo
    cd foo
    touch bar
    echo '/bar\n!/bar' > .gitignore
    git add bar .gitignore
    git commit -mbar
    git check-ignore --verbose --no-index bar

Actual behavior:

    .gitignore:2:!/bar	bar

exit code = 0

Expected behavior:

no output

exit code = 1

I tested with the next branch, which is currently at 8a191e187a9dca3d786c0197f9610e627b4f4137.

The man page of check-ignore says: « For each pathname [...], check whether the file is excluded by .gitignore [...] and output the path if it is excluded. » and: « If the pattern contained a ! prefix or / suffix, it will be preserved in the output. »

The man page of gitignore says: « An optional prefix "!" which negates the pattern; any matching file excluded by a previous pattern will become included again. »

I am not sure how I should understand this situation.

Best regards, Julien