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Fix doc contract for syntax-local-phase-level

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The description does not mention the function ever returning #f
and if you look at the implementation in the C code, it always
returns the result of `scheme_make_integer`.

Also add an example for the entry.
This commit is contained in:
Asumu Takikawa 2014-03-08 16:17:02 -05:00
parent fa81fb35f7
commit 31c60b2893
1 changed files with 18 additions and 2 deletions
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20
pkgs/racket-pkgs/racket-doc/scribblings/reference/stx-trans.scrbl
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@ -647,11 +647,27 @@ contexts.
@transform-time[]}
@defproc[(syntax-local-phase-level) (or/c exact-integer? #f)]{
@defproc[(syntax-local-phase-level) exact-integer?]{
During the dynamic extent of a @tech{syntax transformer} application
by the expander, the result is the @tech{phase level} of the form
being expanded. Otherwise, the result is @racket[0].}
being expanded. Otherwise, the result is @racket[0].
@examples[#:eval stx-eval
(code:comment "a macro bound at phase 0")
(define-syntax (print-phase-level stx)
(printf "phase level: ~a~n" (syntax-local-phase-level))
#'(void))
(require (for-meta 2 racket/base))
(begin-for-syntax
(code:comment "a macro bound at phase 1")
(define-syntax (print-phase-level stx)
(printf "phase level: ~a~n" (syntax-local-phase-level))
#'(void)))
(print-phase-level)
(begin-for-syntax (print-phase-level))
]
}
@defproc[(syntax-local-module-exports [mod-path (or/c module-path?