1 Old Syntactic Forms

▼ |  | Mz Scheme: Legacy Module Language

1 | Old Syntactic Forms
2 | Old Functions

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#%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

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### 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.
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