Hi Tobias, Clarifying one point:
On Mon 06 Feb 2012 20:49, Tobias Gerdin <tger...@gmail.com> writes: >> scheme@(guile-user)> (call-with-prompt 'foo (lambda () >> (call-with-output-string (lambda args (abort-to-prompt 'foo)))) (lambda (k) >> k)) >> $1 = #<partial-continuation 2b63200> >> scheme@(guile-user)> ($1) >> ERROR: In procedure #<partial-continuation 2b63200>: >> ERROR: Throw to key `vm-error' with args `(vm-run "Unrewindable partial >> continuation" (#<vm-continuation 2b73aa0>))'. > > So if a Scheme primitive the program calls happens to be implemented > in C you would run into this problem? Only if that C primitive invokes a Scheme procedure (for example, using scm_call), and you capture the continuation from within that recursively-called Scheme procedure. Like `call-with-output-string' above. Cheers, Andy -- http://wingolog.org/
