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let-rec clarifications

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svn: r14776
This commit is contained in:
Matthew Flatt 2009-05-11 20:13:54 +00:00
parent fd09fd9a33
commit 9375b49d1b
1 changed files with 7 additions and 3 deletions
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10
collects/scribblings/mzc/zo-parse.scrbl
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@ -380,9 +380,13 @@ from before evaluating @scheme[rhs].}
Represents a @scheme[letrec] form with @scheme[lambda] bindings. It
allocates a closure shell for each @scheme[lambda] form in
@scheme[procs], pushes them onto the stack in reverse order, fills out
each shell's closure using the created shells, and then evaluates
@scheme[body].}
@scheme[procs], installs each onto the stack in previously
allocated slots in reverse order (so that the closure shell for the
last element of @scheme[procs] is installed at stack position
@scheme[0]), fills out each shell's closure (where each closure
normally references some other just-created closures, which is
possible because the shells have been installed on the stack), and
then evaluates @scheme[body].}
@defstruct+[(boxenv expr) ([pos exact-nonnegative-integer?]