`pr -tre` requires a value, but gnu's implementation doesn't

[panlinux]

rust coreutils v0.9.0:

$ echo oi | pr -tre
error: a value is required for '--expand-tabs <[CHAR][WIDTH]>' but none was supplied

For more information, try '--help'.

gnu:

$ echo oi | pr -tre
oi

Found out while investigating a postfix build failure, which failed with:

../mantools/makereadme ../html/index.html | ../mantools/html2readme | pr -tre >../README_FILES/AAAREADME
Unrecognized command line option "-style", try "-help".
error: a value is required for '--expand-tabs <[CHAR][WIDTH]>' but none was supplied

For more information, try '--help'.

[oech3]

pr -tr -e works. Maybe, clap-rs's issue?