▼Mz Scheme: Legacy Language
On this page:
#%module-begin
#%plain-module-begin
#%plain-lambda
lambda
λ
#%app
#%plain-app
define
define-syntax
define-for-syntax
if
cond
case
fluid-let
define-struct
let-struct
require
require-for-syntax
require-for-template
require-for-label
provide
provide-for-syntax
provide-for-label
#%datum
#%top-interaction
  top← prev  up  next → 

1 Old Syntactic Forms

(#%module-begin form ...)
Like #%plain-module-begin from scheme/base, but (require-for-syntax mzscheme) is added to the beginning of the form sequence, thus importing mzscheme into the transformer environment for the module body. (In contrast, scheme/base exports for-syntax minimal transformer support, while scheme exports all of scheme/base for-syntax.)

(#%plain-module-begin form ...)
The same binding as #%plain-module-begin from scheme/base.

(#%plain-lambda formals body ...+)
The same binding as #%plain-lambda in scheme/base. (This binding was not present in version 372 and earlier.)

(lambda formals body ...+)
(λ formals body ...+)
The same bindings as #%plain-lambda.

(#%app proc-expr arg-expr ...)
(#%app)
The same binding as #%plain-app from scheme/base.

(#%plain-app proc-expr arg-expr ...)
(#%plain-app)
The same binding as #%app. (This binding was not present in version 372 and earlier.)

(define id expr)
(define (head args) body ...+)
 
head = id
  | (head args)
     
args = arg-id ...
  | arg-id ... . rest-id
Like define in scheme/base, but without support for keyword arguments or optional arguments.

(define-syntax id expr)
(define-syntax (head args) body ...+)
(define-for-syntax id expr)
(define-for-syntax (head args) body ...+)
Like define-syntax and define-for-syntax in scheme/base, but without support for keyword arguments or optional arguments (i.e., head is as for define).

(if test-expr then-expr else-expr)
(if test-expr then-expr)
Like if in scheme/base, but else-expr defaults to (void).

(cond cond-clause ...)
(case val-expr case-clause ...)
Like cond and case in scheme/base, but else and => are recognized as unbound identifiers, instead of as the scheme/base bindings.

(fluid-let ([id expr] ...) body ...+)
Provides a kind of dynamic binding via mutation of the ids.

The fluid-let form first evaluates each expr to obtain an entry value for each id. As evaluation moves into body, either though normal evaluation or a continuation jump, the current value of each id is swapped with the entry value. On exit from body, then the current value and entry value are swapped again.

(define-struct id-maybe-super (field-id ...) maybe-inspector-expr)
 
maybe-inspector-expr = 
  | expr
Like define-struct from scheme/base, but with fewer options. Each field is implicitly mutable, and the optional expr is analogous to supplying an #:inspector expression.

(let-struct id-maybe-super (field-id ...) body ...+)
Expands to

(let ()
  (define-struct id-maybe-super (field-id ...))
  body ...+)

(require raw-require-spec)
(require-for-syntax raw-require-spec)
(require-for-template raw-require-spec)
(require-for-label raw-require-spec)
(provide raw-provide-spec)
(provide-for-syntax raw-provide-spec)
(provide-for-label raw-provide-spec)
Like #%require and #%provide. The -for-syntax, -for-template, and -for-label forms are translated to #%require and #%provide using for-syntax, for-template, and for-label sub-forms, respectively.

(#%datum . datum)
Expands to 'datum, even if datum is a keyword.

(#%top-interaction . form)
The same as #%top-interaction in scheme/base.

  top← prev  up  next →