5 ! guile
-c '(require-extension 7)' 2> /dev
/null
6 ! guile
-c '(require-extension (blarg))' 2> /dev
/null
7 ! guile
-c '(require-extension (srfi "foo"))' 2> /dev
/null
9 guile
-c '(require-extension (srfi 1)) (exit (procedure? take-right))'
10 guile
-c '(require-extension (srfi))'