Re: define-language

[Matt Wette <matt.wette@gmail.com>]

On 8/7/20 12:31 PM, Stephen Scheck wrote:
> What is the right way to use `define-language`? The Guile manual says that
> when using this form "the language will be added to the global language
> set." I interpret that to mean that the `,language` meta-command switches
> the REPL to use the newly-defined language, but it doesn't work:
>
> scheme@(guile-user)> (use-modules (system base language))
> scheme@(guile-user)> (define-language mylingua
>    #:title "Mylingua"
>    #:reader (lambda (port env) ...)
>    #:evaluator (lambda (x module) ...)
>    #:printer write)
> scheme@(guile-user)> mylingua
> $1 = #<<language> name: mylingua title: "Mylingua" reader: #<procedure
> 1bfcd38 at <unknown port>:5:11 (port env)> printer: #<procedure write (_
> #:optional _)> parser: #f compilers: () decompilers: () evaluator:
> #<procedure 1bfcd48 at <unknown port>:6:14 (x module)> joiner: #f
> for-humans?: #t make-default-environment: #<procedure
> make-fresh-user-module ()> lowerer: #f analyzer: #f compiler-chooser: #f>
> scheme@(guile-user)> ,language mylingua
> While executing meta-command:
> no such language mylingua

Also, I believe you need to have the language defined in a
module (i.e., define-module) with path (language mylingua spec)
in file spec.scm in a subdirectory language/mylingua.