1 Accessing Check Syntax Programmatically

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show-content
make-traversal
current-annotations
current-max-to-send-at-once
syncheck-annotations<%>
syncheck: find-source-object
syncheck: add-text-type
syncheck: add-background-color
syncheck: add-require-open-menu
syncheck: add-docs-menu
syncheck: add-id-set
syncheck: add-arrow
syncheck: add-arrow/ name-dup
syncheck: add-arrow/ name-dup/ pxpy
syncheck: add-tail-arrow
syncheck: add-mouse-over-status
syncheck: add-prefixed-require-reference
syncheck: add-unused-require
syncheck: add-jump-to-definition
syncheck: add-jump-to-definition/ phase-level+ space
syncheck: add-definition-target
syncheck: add-definition-target/ phase-level+ space
syncheck: unused-binder
syncheck: color-range
syncheck: add-rename-menu
annotations-mixin
syncheck: find-source-object
syncheck: add-text-type
syncheck: add-background-color
syncheck: add-require-open-menu
syncheck: add-docs-menu
syncheck: add-rename-menu
syncheck: add-arrow
syncheck: add-arrow/ name-dup
syncheck: add-arrow/ name-dup/ pxpy
syncheck: add-tail-arrow
syncheck: add-mouse-over-status
syncheck: add-jump-to-definition
syncheck: add-jump-to-definition/ phase-level+ space
syncheck: add-definition-target
syncheck: add-definition-target/ phase-level+ space
syncheck: unused-binder
syncheck: add-id-set
syncheck: color-range
syncheck: add-prefixed-require-reference
syncheck: add-unused-require

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## 1 Accessing Check Syntax Programmatically🔗ℹ

(require drracket/check-syntax)
| package: drracket-tool-text-lib

> > procedure
> > (show-content |  | file-or-stx |
> > | [ | #:fully-expanded? fully-expanded? |
> > |  | #:namespace namespace]) |
> → (listof vector?)
> | file-or-stx |  | : |  |
> (or/c path-string?
> (and/c syntax?
> (λ (x) (path-string? (syntax-source x)))))
> fully-expanded? : boolean? = #f
> namespace : (or/c #f namespace?) = #f

This procedure provides a simplified interface to the rest of the library, as shown in the example below. The list it returns has one vector for each call that would be made to the object in current-annotations. Each vector’s first element is a symbol naming a method in syncheck-annotations<%> and the other elements of the vector are the arguments passed to the method. (Note that this procedure does not account for the callback procedures present in syncheck:add-arrow/name-dup/pxpy.)

The file-or-stx argument gives the input program and fully-expanded? indicates if the file-or-stx argument has already been fully expanded (it is ignored if file-or-stx is not syntax). The namespace argument is installed as the current-namespace or, if namespace is #f, then a new namespace is created, using (make-base-namespace).

See annotations-mixin for some example code to use the other parts of this library.

Note that the paths in the example below have been replaced via make-paths-be-module-paths in order to make the results be platform independent.

> > (define (make-paths-be-module-paths x)
> (let loop ([x x])
> (cond
> [(pair? x) (cons (loop (car x)) (loop (cdr x)))]
> [(vector? x) (for/vector ([x (in-vector x)])
> (loop x))]
> [(path? x) (path->relative-string/library x)]
> [else x])))
> > (let ([example-module
> '(module m racket (λ (x) x))])
> (make-paths-be-module-paths
> (show-content
> (read-syntax
> (build-path (current-directory) "dummy-file.rkt")
> (open-input-string (format "~s" example-module))))))
> '(#(syncheck:add-require-open-menu 10 16 "<collects>/racket/main.rkt")
> #(syncheck:add-tail-arrow 17 25)
> #(syncheck:add-arrow/name-dup/pxpy
> 22
> 23
> 0.5
> 0.5
> 25
> 26
> 0.5
> 0.5
> #t
> 0
> #f
> #<procedure:name-dup?>)
> #(syncheck:add-text-type 18 20 document-identifier)
> #(syncheck:add-docs-menu
> 18
> 20
> λ
> "View documentation for “λ” from racket/base, racket"
> "<pkgs>/racket-doc/scribblings/reference/doc/reference/lambda.html"
> (form ((lib "racket/private/base.rkt") λ))
> "(form._((lib._racket/private/base..rkt)._~ce~bb))")
> #(syncheck:add-jump-to-definition/phase-level+space
> 18
> 20
> new-lambda
> "<collects>/racket/private/kw.rkt"
> ()
> 0)
> #(syncheck:add-mouse-over-status 18 20 "imported from racket")
> #(syncheck:add-arrow/name-dup/pxpy
> 10
> 16
> 0.5
> 0.5
> 18
> 20
> 0.5
> 0.5
> #t
> 0
> module-lang
> #<procedure:name-dup?>)
> #(syncheck:add-text-type 18 20 document-identifier)
> #(syncheck:add-docs-menu
> 18
> 20
> λ
> "View documentation for “λ” from racket/base, racket"
> "<pkgs>/racket-doc/scribblings/reference/doc/reference/lambda.html"
> (form ((lib "racket/private/base.rkt") λ))
> "(form._((lib._racket/private/base..rkt)._~ce~bb))")
> #(syncheck:add-jump-to-definition/phase-level+space
> 18
> 20
> new-lambda
> "<collects>/racket/private/kw.rkt"
> ()
> 0)
> #(syncheck:add-mouse-over-status 18 20 "imported from racket")
> #(syncheck:add-arrow/name-dup/pxpy
> 10
> 16
> 0.5
> 0.5
> 18
> 20
> 0.5
> 0.5
> #t
> 0
> module-lang
> #<procedure:name-dup?>)
> #(syncheck:add-text-type 1 7 document-identifier)
> #(syncheck:add-docs-menu
> 1
> 7
> module
> "View documentation for “module” from racket/base, racket"
> "<pkgs>/racket-doc/scribblings/reference/doc/reference/module.html"
> (form ('#%kernel module))
> "(form._((quote._~23~25kernel)._module))")
> #(syncheck:add-mouse-over-status 10 16 "1 bound occurrence")
> #(syncheck:add-mouse-over-status 22 23 "1 bound occurrence"))

Changed in version 1.2 of package drracket-tool-text-lib: Added the #:fully-expanded and #:namespace arguments.

> > procedure
> > (make-traversal namespace path) |  | → |  |
> > (->* (syntax?)
> > ((-> any/c void?))
> > void?)
> > (-> void?)
> namespace : namespace?
> path : (or/c #f path-string?)

This function creates some local state about a traversal of syntax objects and returns two functions. The first one should be called with each of the (fully expanded) syntax objects that make up a program (there will be only one if the program is a module) and then the second one should be called to indicate there are no more.

The optional argument to the first function is ignored. It is left there for historical reasons. In the past it was called for each sequence of binding identifiers encountered in define-values, define-syntaxes, and define-values-for-syntax.

During the dynamic extent of the call to the two result functions, the value of the current-annotations parameter is consulted and various methods are invoked in the corresponding object (if any), to indicate what has been found in the syntax object. These methods will only be called if the syntax objects have source locations.

The path argument indicates a directory whose traversal should operate on. When path is #f, it defaults to (current-directory). Otherwise, the path is simplified via simple-form-path before it’s used.

> parameter (current-annotations)
> → (or/c #f (is-a?/c syncheck-annotations<%>))
> (current-annotations ca) → void?
> ca : (or/c #f (is-a?/c syncheck-annotations<%>))

The methods of the value of this parameter are invoked by the functions returned from make-traversal.

> parameter (current-max-to-send-at-once)
> → (or/c +inf.0 (and/c exact-integer? (>=/c 2)))
> (current-max-to-send-at-once m) → void?
> m : (or/c +inf.0 (and/c exact-integer? (>=/c 2)))

No longer used.

interface syncheck-annotations<%> : interface?

Classes implementing this interface are acceptors of information about a traversal of syntax objects. See make-traversal.
Do not implement this interface directly, as it is liable to change without warning. Instead, use the annotations-mixin and override the methods you’re interested in. The annotations-mixin will keep in sync with this interface, providing methods that ignore their arguments.

> > method (send a-syncheck-annotations syncheck:find-source-object stx)
> > → (or/c #f (not/c #f))
> > stx : syntax?

> This should return #f if the source of this syntax object is uninteresting for annotations (if, for example, the only interesting annotations are those in the original file and this is a syntax object introduced by a macro and thus has a source location from some other file).

> Otherwise, it should return some (non-#f) value that will then be passed to one of the other methods below as a source-obj argument. Also, the result of this method is used as a key in an equal?-based hash, so two source objects should refer to the same original source if and only if they are equal?.

> > > method
> > > (send a-syncheck-annotations syncheck:add-text-type |
> > > |  | source-obj |
> > > |  | start |
> > > |  | end |
> > > |  | text-type) |
> > → void?
> > source-obj : (not/c #f)
> > start : exact-nonnegative-integer?
> > end : exact-nonnegative-integer?
> > | text-type |  | : |  |
> > (or/c 'matching-identifiers
> > 'unused-identifier
> > 'document-identifier)

> Called to indicate that the color associated with the text type text-type should be drawn on the background of the given range in the editor, when the mouse moves over it.

> This method is usually called by Check Syntax to add background colors to an identifier based on its lexical information. The types 'matching-identifiers, 'unused-identifier and 'document-identifier correspond to the color 'drracket:syncheck:matching-identifiers, 'drracket:syncheck:unused-identifier and 'drracket:syncheck:document-identifier in color scheme specifications, respectively. See Color Schemes.

> See syncheck:add-require-open-menu for information about the start and end arguments.

> Added in version 1.8 of package drracket-tool-text-lib.

> > > method
> > > (send a-syncheck-annotations syncheck:add-background-color |
> > > |  | source-obj |
> > > |  | start |
> > > |  | end |
> > > |  | color) |
> > → void?
> > source-obj : (not/c #f)
> > start : exact-nonnegative-integer?
> > end : exact-nonnegative-integer?
> > color : string?

> Called to indicate that the color color should be drawn on the background of the given range in the editor, when the mouse moves over it.

> This method is not directly called by Check Syntax anymore. Instead see syncheck:add-text-type.

> > > method
> > > (send a-syncheck-annotations syncheck:add-require-open-menu |
> > > |  | source-obj |
> > > |  | start |
> > > |  | end |
> > > |  | file) |
> > → void?
> > source-obj : (not/c #f)
> > start : exact-nonnegative-integer?
> > end : exact-nonnegative-integer?
> > file : path-string?

> Called to indicate that there is a require at the location from start to end, and that it corresponds to file.

> The start and end coordinates typically come from a syntax object in the file that was processed (although they can be completely synthesized by macros in some situations). The start coordinate is one less than that syntax object’s syntax-position field, and the end is the start plus that syntax-object’s syntax-span field. Thus, it is always the case that (<= start end) is true. In some situations, it may be that start can equal end.

> Check Syntax adds a popup menu.

> > > method
> > > (send a-syncheck-annotations syncheck:add-docs-menu |
> > > |  | source-obj |
> > > |  | start |
> > > |  | end |
> > > |  | id |
> > > |  | label |
> > > |  | definition-tag |
> > > |  | path |
> > > |  | tag) |
> > → void?
> > source-obj : (not/c #f)
> > start : exact-nonnegative-integer?
> > end : exact-nonnegative-integer?
> > id : symbol?
> > label : any/c
> > definition-tag : definition-tag?
> > path : any/c
> > tag : any/c

> Called to indicate that there is something that has documentation between the range start and end. The documented identifier’s name is given by id and the docs are found in the html file path at the html tag tag. The definition-tag argument matches the documented definition. The label argument describes the binding for use in the menu item (although it may be longer than 200 characters).

> See syncheck:add-require-open-menu for information about the coordinates start and end.

> > > method
> > > (send a-syncheck-annotations syncheck:add-id-set |
> > > |  | all-ids |
> > > |  | new-name-interferes?) |
> > → void?
> > | all-ids |  | : |  |
> > (listof (list/c (not/c #f)
> > exact-nonnegative-integer?
> > exact-nonnegative-integer?))
> > new-name-interferes? : (-> symbol boolean?)

> This method is no longer called by Check Syntax. It is here for backwards compatibility only. The information it provided must now be synthesized from the information supplied to syncheck:add-arrow/name-dup/pxpy.

> > > method
> > > (send a-syncheck-annotations syncheck:add-arrow |
> > > |  | start-source-obj |
> > > |  | start-left |
> > > |  | start-right |
> > > |  | end-source-obj |
> > > |  | end-left |
> > > |  | end-right |
> > > |  | actual? |
> > > |  | phase-level) |
> > → void?
> > start-source-obj : (not/c #f)
> > start-left : exact-nonnegative-integer?
> > start-right : exact-nonnegative-integer?
> > end-source-obj : (not/c #f)
> > end-left : exact-nonnegative-integer?
> > end-right : exact-nonnegative-integer?
> > actual? : boolean?
> > phase-level : (or/c exact-nonnegative-integer? #f)

> This function is not called directly anymore by Check Syntax. Instead syncheck:add-arrow/name-dup/pxpy is.

> This method is invoked by the default implementation of syncheck:add-arrow/name-dup in annotations-mixin.

> See syncheck:add-require-open-menu for information about the coordinates; start-left and start-right are a pair like syncheck:add-require-open-menu’s start and end, as are end-left and end-right.

> > > method
> > > (send a-syncheck-annotations syncheck:add-arrow/name-dup |
> > > |  | start-source-obj |
> > > |  | start-left |
> > > |  | start-right |
> > > |  | end-source-obj |
> > > |  | end-left |
> > > |  | end-right |
> > > |  | actual? |
> > > |  | phase-level |
> > > |  | require-arrow? |
> > > |  | name-dup?) |
> > → void?
> > start-source-obj : (not/c #f)
> > start-left : exact-nonnegative-integer?
> > start-right : exact-nonnegative-integer?
> > end-source-obj : (not/c #f)
> > end-left : exact-nonnegative-integer?
> > end-right : exact-nonnegative-integer?
> > actual? : boolean?
> > phase-level : (or/c exact-nonnegative-integer? #f)
> > require-arrow? : boolean?
> > name-dup? : (-> string? boolean?)

> This function is not called directly anymore by Check Syntax. Instead syncheck:add-arrow/name-dup/pxpy is.

> The default implementation of syncheck:add-arrow/name-dup/pxpy discards the start-px start-py end-px end-py arguments and calls this method.

> See syncheck:add-require-open-menu for information about the coordinates; start-left and start-right are a pair like syncheck:add-require-open-menu’s start and end, as are end-left and end-right.

> > > method
> > > (send a-syncheck-annotations syncheck:add-arrow/name-dup/pxpy |
> > > |  | start-source-obj |
> > > |  | start-left |
> > > |  | start-right |
> > > |  | start-px |
> > > |  | start-py |
> > > |  | end-source-obj |
> > > |  | end-left |
> > > |  | end-right |
> > > |  | end-px |
> > > |  | end-py |
> > > |  | actual? |
> > > |  | phase-level |
> > > |  | require-arrow |
> > > |  | name-dup?) |
> > → void?
> > start-source-obj : (not/c #f)
> > start-left : exact-nonnegative-integer?
> > start-right : exact-nonnegative-integer?
> > start-px : (real-in 0 1)
> > start-py : (real-in 0 1)
> > end-source-obj : (not/c #f)
> > end-left : exact-nonnegative-integer?
> > end-right : exact-nonnegative-integer?
> > end-px : (real-in 0 1)
> > end-py : (real-in 0 1)
> > actual? : boolean?
> > phase-level : (or/c exact-nonnegative-integer? #f)
> > require-arrow : (or/c boolean? 'module-lang)
> > name-dup? : (-> string? boolean?)

> Called to indicate that there should be an arrow between the locations described by the first ten arguments. The start-px and start-py indicate how far along the diagonal between the upper-left coordinate of the editor position start-left and the bottom-right of the editor position start-right to draw the foot of the arrow. The end-px and end-py indicate the same things for the head of the arrow.

> The phase-level argument indicates the phase of the binding and the actual? argument indicates if the binding is a real one, or a predicted one from a syntax template (predicted bindings are drawn with question marks in Check Syntax).

> The require-arrow argument indicates if this arrow points from an imported identifier to its corresponding require. Any true value means that it points to an import via require; #t means it was a normal require and 'module-lang means it comes from the implicit require that a module language provides.

> The name-dup? predicate returns #t in case that this variable (either the start or end), when replaced with the given string, would shadow some other binding (or otherwise interfere with the binding structure of the program at the time the program was expanded).

> See syncheck:add-require-open-menu for information about the coordinates; start-left and start-right are a pair like syncheck:add-require-open-menu’s start and end, as are end-left and end-right.

> Changed in version 1.1 of package drracket-tool-text-lib: Changed require-arrow to sometimes be 'module-lang.

> > > method
> > > (send a-syncheck-annotations syncheck:add-tail-arrow |
> > > |  | from-source-obj |
> > > |  | from-pos |
> > > |  | to-source-obj |
> > > |  | to-pos) |
> > → void?
> > from-source-obj : (not/c #f)
> > from-pos : exact-nonnegative-integer?
> > to-source-obj : (not/c #f)
> > to-pos : exact-nonnegative-integer?

> Called to indicate that there are two expressions, beginning at from-pos and to-pos that are in tail position with respect to each other.

> > > method
> > > (send a-syncheck-annotations syncheck:add-mouse-over-status |
> > > |  | source-obj |
> > > |  | start |
> > > |  | end |
> > > |  | str) |
> > → void?
> > source-obj : (not/c #f)
> > start : exact-nonnegative-integer?
> > end : exact-nonnegative-integer?
> > str : string?

> Called to indicate that the message in str should be shown when the mouse passes over a position in the given range between start and end.

> See syncheck:add-require-open-menu for information about the coordinates start and end.

> > > method
> > > (send a-syncheck-annotations syncheck:add-prefixed-require-reference |
> > > |  | req-src |
> > > |  | req-pos-left |
> > > |  | req-pos-right |
> > > |  | prefix |
> > > |  | prefix-src |
> > > |  | prefix-left |
> > > |  | prefix-right) |
> > → void?
> > req-src : (not/c #f)
> > req-pos-left : exact-nonnegative-integer?
> > req-pos-right : exact-nonnegative-integer?
> > prefix : symbol?
> > prefix-src : any/c
> > prefix-left : (or/c #f exact-nonnegative-integer?)
> > prefix-right : (or/c #f exact-nonnegative-integer?)

> This method is called for each require in the program that has a prefix or prefix-all-except around it in fully expanded form (i.e., it seems to come from a prefix-in or a similar form).

> The method is passed the location of the require in the original program, as well as the prefix (as a symbol) and the source locations of the prefix (if they are available).

> See syncheck:add-require-open-menu for information about the coordinates; req-pos-left and req-pos-right are a pair like syncheck:add-require-open-menu’s start and end, as are prefix-left and prefix-right.

> > > method
> > > (send a-syncheck-annotations syncheck:add-unused-require |
> > > |  | req-src |
> > > |  | start |
> > > |  | end) |
> > → void?
> > req-src : (not/c #f)
> > start : exact-nonnegative-integer?
> > end : exact-nonnegative-integer?

> This method is called for each require that Check Syntax determines to be unused. The method is passed the location of the name of the required module in the original program.

> See syncheck:add-require-open-menu for information about the coordinates start and end.

> > > method
> > > (send a-syncheck-annotations syncheck:add-jump-to-definition |
> > > |  | source-obj |
> > > |  | start |
> > > |  | end |
> > > |  | id |
> > > |  | filename |
> > > |  | submods) |
> > → void?
> > source-obj : (not/c #f)
> > start : exact-nonnegative-integer?
> > end : exact-nonnegative-integer?
> > id : any/c
> > filename : path-string?
> > submods : (listof symbol?)

> This function is not called directly anymore by Check Syntax. Instead syncheck:add-jump-to-definition/phase-level+space is.

> The default implementation of syncheck:add-jump-to-definition/phase-level+space discards the phase-level argument and calls this method.

> > > method
> > > (send a-syncheck-annotations syncheck:add-jump-to-definition/phase-level+space |
> > > |  | source-obj |
> > > |  | start |
> > > |  | end |
> > > |  | id |
> > > |  | filename |
> > > |  | submods |
> > > |  | phase-level+space) |
> > → void?
> > source-obj : (not/c #f)
> > start : exact-nonnegative-integer?
> > end : exact-nonnegative-integer?
> > id : any/c
> > filename : path-string?
> > submods : (listof symbol?)
> > phase-level+space : phase+space-shift?

> Called to indicate that there is some identifier at the given location (named id) that is defined in the submods of the file filename (where an empty list in submods means that the identifier is defined at the top-level module), at the phase level phase-level.

> See syncheck:add-require-open-menu for information about the coordinates start and end.

> Added in version 1.2 of package drracket-tool-text-lib.

> > > method
> > > (send a-syncheck-annotations syncheck:add-definition-target |
> > > |  | source-obj |
> > > |  | start |
> > > |  | finish |
> > > |  | id |
> > > |  | mods) |
> > → void?
> > source-obj : (not/c #f)
> > start : exact-nonnegative-integer?
> > finish : exact-nonnegative-integer?
> > id : symbol?
> > mods : (listof symbol?)

> This function is not called directly anymore by Check Syntax. Instead syncheck:add-definition-target/phase-level+space is.

> The default implementation of syncheck:add-definition-target/phase-level+space discards the phase-level argument and calls this method.

> > > method
> > > (send a-syncheck-annotations syncheck:add-definition-target/phase-level+space |
> > > |  | source-obj |
> > > |  | start |
> > > |  | finish |
> > > |  | id |
> > > |  | mods |
> > > |  | phase-level) |
> > → void?
> > source-obj : (not/c #f)
> > start : exact-nonnegative-integer?
> > finish : exact-nonnegative-integer?
> > id : symbol?
> > mods : (listof symbol?)
> > phase-level : phase+space-shift?

> Called to indicate a top-level definition at the location spanned by start and finish. The id argument is the name of the defined variable and the mods are the submodules enclosing the definition, which will be empty if the definition is in the top-level module. The phase-level argument indicates the phase level.

> See syncheck:add-require-open-menu for information about the coordinates start and end.

> Added in version 1.2 of package drracket-tool-text-lib.

> > > method
> > > (send a-syncheck-annotations syncheck:unused-binder |
> > > |  | source-obj |
> > > |  | left |
> > > |  | right) |
> > → void?
> > source-obj : (not/c #f)
> > left : exact-nonnegative-integer?
> > right : exact-nonnegative-integer?

> Called to indicate that there is a binder with no references in source-obj at the location spanned by left and right.

> Added in version 1.4 of package drracket-tool-text-lib.

> > > method
> > > (send a-syncheck-annotations syncheck:color-range |  | source-obj |
> > > |  | start |
> > > |  | end |
> > > |  | style-name) |
> > → void?
> > source-obj : (not/c #f)
> > start : exact-nonnegative-integer?
> > end : exact-nonnegative-integer?
> > style-name : any/c

> Called to indicate that the given location should be colored according to the style style-name.

> See syncheck:add-require-open-menu for information about the coordinates start and end.

> > > method
> > > (send a-syncheck-annotations syncheck:add-rename-menu |
> > > |  | id |
> > > |  | all-ids |
> > > |  | new-name-interferes?) |
> > → void?
> > id : symbol?
> > | all-ids |  | : |  |
> > (listof (list/c (not/c #f)
> > exact-nonnegative-integer?
> > exact-nonnegative-integer?))
> > new-name-interferes? : (-> symbol boolean?)

> This method is listed only for backwards compatibility. It is not called by Check Syntax anymore.

mixin annotations-mixin : (class? . -> . class?)
result implements: | syncheck-annotations<%>

Supplies all of the methods in syncheck-annotations<%> with default behavior. Be sure to use this mixin to future-proof your code and then override the methods you’re interested in.

By default:

- The syncheck:find-source-object method ignores its arguments and returns #f;

- the syncheck:add-arrow/name-dup method drops the require-arrow? and name-dup? arguments and calls syncheck:add-arrow;

- the syncheck:add-arrow/name-dup/pxpy method drops the from-px, from-py, to-px, and to-py arguments and calls syncheck:add-arrow/name-dup; and

- all of the other methods ignore their arguments and return (void).

Here is an example showing how use this library to extract all of the arrows that Check Syntax would draw from various expressions. One subtle point: arrows are only included when the corresponding identifiers are syntax-original?; the code below manages this by copying the properties from an identifier that is syntax-original? in the call to datum->syntax.

> > (define arrows-collector%
> (class (annotations-mixin object%)
> (super-new)
> (define/override (syncheck:find-source-object stx)
> stx)
> (define/override (syncheck:add-arrow/name-dup/pxpy
> start-source-obj start-left start-right start-px start-py
> end-source-obj end-left end-right end-px end-py
> actual? phase-level require-arrow? name-dup?)
> (set! arrows
> (cons (list start-source-obj end-source-obj)
> arrows)))
> (define arrows '())
> (define/public (get-collected-arrows) arrows)))
> > (define (arrows form)
> (define base-namespace (make-base-namespace))
> (define-values (add-syntax done)
> (make-traversal base-namespace #f))
> (define collector (new arrows-collector%))
> (parameterize ([current-annotations collector]
> [current-namespace base-namespace])
> (add-syntax (expand form))
> (done))
> (send collector get-collected-arrows))
> > (define (make-id name pos orig?)
> (datum->syntax
> #f
> name
> (list #f #f #f pos (string-length (symbol->string name)))
> (and orig? #'is-orig)))
> > (arrows `(λ (,(make-id 'x 1 #t)) ,(make-id 'x 2 #t)))
> '((#<syntax x> #<syntax x>))
> > (arrows `(λ (x) x))
> '()
> > (arrows `(λ (,(make-id 'x 1 #f)) ,(make-id 'x 2 #t)))
> '()
> > (arrows `(λ (,(make-id 'x 1 #t)) x))
> '()

> syntax syncheck:find-source-object

Bound to an identifier created with define-local-member-name that is used as the syncheck:find-source-object method of syncheck-annotations<%>.

> syntax syncheck:add-text-type

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-text-type method of syncheck-annotations<%>.

> syntax syncheck:add-background-color

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-background-color method of syncheck-annotations<%>.

> syntax syncheck:add-require-open-menu

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-require-open-menu method of syncheck-annotations<%>.

> syntax syncheck:add-docs-menu

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-docs-menu method of syncheck-annotations<%>.

> syntax syncheck:add-rename-menu

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-rename-menu method of syncheck-annotations<%>.

> syntax syncheck:add-arrow

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-arrow method of syncheck-annotations<%>.

> syntax syncheck:add-arrow/name-dup

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-arrow/name-dup method of syncheck-annotations<%>.

> syntax syncheck:add-arrow/name-dup/pxpy

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-arrow/name-dup/pxpy method of syncheck-annotations<%>.

> syntax syncheck:add-tail-arrow

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-tail-arrow method of syncheck-annotations<%>.

> syntax syncheck:add-mouse-over-status

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-mouse-over-status method of syncheck-annotations<%>.

> syntax syncheck:add-jump-to-definition

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-jump-to-definition method of syncheck-annotations<%>.

> syntax syncheck:add-jump-to-definition/phase-level+space

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-jump-to-definition/phase-level+space method of syncheck-annotations<%>.

> syntax syncheck:add-definition-target

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-definition-target method of syncheck-annotations<%>.

> syntax syncheck:add-definition-target/phase-level+space

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-definition-target/phase-level+space method of syncheck-annotations<%>.

> syntax syncheck:unused-binder

Bound to an identifier created with define-local-member-name that is used as the syncheck:unused-binder method of syncheck-annotations<%>.

> syntax syncheck:add-id-set

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-id-set method of syncheck-annotations<%>.

> syntax syncheck:color-range

Bound to an identifier created with define-local-member-name that is used as the syncheck:color-range method of syncheck-annotations<%>.

> syntax syncheck:add-prefixed-require-reference

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-prefixed-require-reference method of syncheck-annotations<%>.

> syntax syncheck:add-unused-require

Bound to an identifier created with define-local-member-name that is used as the syncheck:add-unused-require method of syncheck-annotations<%>.
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