No `syntax-protect` is needed for `define/private`, etc., because no
new identifiers or expressions are introduced. Adding extra dye packs
can interfere with other macros that pull apart syntax (although maybe
the macros shouldn't do that without using `syntax-disarm`).
A custodian doesn't provide any order on shutting down the objects
that it manages (I was confused about some past experiments), so
avoid that assumption.
Getting the current CPU time is relatively expensive, so get it only
on thread swaps where a thread used its full quantum or 1/100 swaps
otherwise. This approximation should work because thread-specific CPU
times are rarely requested, and they make the most sense for threads
that don't constantly swap out due to synchronization.
Formerly, an expression like `(arity-at-least-value 7)` could crash,
because the `arity-at-least-value` accessor is created in unsafe mode,
and the slow path to accessor errors attempted to use the accessor to
provoke an error message. Instead of using a potentially unsafe
accessor, have the slow path raise an error explicitly with
`raise-argument-arror`. That change has the added benefit of making
error messages mach traditional Racket (at least for structure types
that are not declared as "authentic").
The problem was exposed by tests added in 55dcdf5538.
Instead of a separate hash table mapping continuations to
linklet-instance names, use a continuation mark. That's faster,
because capturing a continuation means copying part of it on continue.
Currently, Check Syntax has trouble correlating `require` forms and
references to imports that go through a macro-introduced rename
transformer. For example, there's no binding arrow from the final
`starting` to the `racket/list` in
#lang racket/base
(require (for-syntax racket/base))
(define-syntax-rule (define-as-first mod starting)
(begin
(require (only-in mod
[first initial]))
(define-syntax starting (make-rename-transformer #'initial))
starting))
(define-as-first racket/list starting)
starting
But change the last two `starting`s to `initial`, and the binding
arrows work.
Until a general repair is in place for Check Syntax, this commit
adjusts 38d612dba6 to use the original export name for an immediate
binding, which acts as a hint to the current Check Syntax
implemenration.
Note that the source-distribution client must have a
"build/ChezScheme" checkout created, maybe by building as a 'cs
variant. A pruned version of that checkout is then included with other
sources. The resulting source distributon then works for building
either Racket variant.
Adapt the configure scripts and makefiles to use a "ChezScheme"
directory that is bundled with sources.
Some expressions like (date-day) gave usually an arity error, but when they
were inlined by the JIT the arity check was wrong, so they produce a segfault
or a nonsensical result.
Provide a way to build Chez Scheme from source using Racket. In the
short run, this lets us distribute source that ultimately depends only
on a C compiler (since a variant of Racket can be built from source
using just a C compiler).
