1 Old Syntactic Forms

1 Old Syntactic Forms🔗ℹ

syntax
(#%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.)

syntax
(#%plain-module-begin form ...)

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

syntax
(#%plain-lambda formals body ...+)

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

syntax
(lambda formals body ...+)
syntax
(λ formals body ...+)

The same bindings as #%plain-lambda.

syntax
(#%app proc-expr arg-expr ...)
(#%app)

The same binding as #%plain-app from scheme/base.

syntax
(#%plain-app proc-expr arg-expr ...)
(#%plain-app)

The same binding as #%app. (This binding was not present in version 372 and earlier.)

syntax
(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.

syntax
(define-syntax id expr)
(define-syntax (head args) body ...+)
syntax
(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).

syntax
(if test-expr then-expr else-expr)
(if test-expr then-expr)

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

syntax
(cond cond-clause ...)
syntax
(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.

syntax
(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.

syntax
(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.

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

Expands to

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

syntax
(require raw-require-spec)
syntax
(require-for-syntax raw-require-spec)
syntax
(require-for-template raw-require-spec)
syntax
(require-for-label raw-require-spec)
syntax
(provide raw-provide-spec)
syntax
(provide-for-syntax raw-provide-spec)
syntax
(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.

syntax
(#%datum . datum)

Expands to 'datum, even if datum is a keyword.

syntax
(#%top-interaction . form)

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

1	Old Syntactic Forms
2	Old Functions
3	Extra Libraries
4	Omitted Forms and Functions