Using an impersonator property to represent an application mark was
a bad choice. The property gets propagated, so it is also on any later
chaperone layer, and then things go bad: the docs say that special
treatment is triggered by supplying an argument to `impersonate-property',
but it was actually triggered by the chaperone having the property.
Change the implementation to match the documentation. Using an
impersonator property to supply the mark should be regarded as a hack,
but now the implementaiton is at least consistent with the documentaiton.
- put the tests together with the other define-union-language tests
- fix the docs
- add a release note
- construct the merged language a bit more directly
- properly deal with this kind of thing:
(define-language L1 (e f ::= 1 2 3))
(define-language L2 (e g ::= 4 5 6))
(define-union-language L L1 L2)
"-rdynamic" doesn't work with GCC 4.7 on OpenBSD: "cc: error:
unrecognized command line option '-rdynamic'". The switch isn't
necessary because it is only a wrapper to "-Wl,--export-dynamic".
Look GCC bug 37454.
This ensures that `=>` and `else` have the same bindings as the ones in
`racket/private/cond`; otherwise it would not be possible to use SRFI 61
`cond` from a `#lang racket/base` program/module.
Tested under both `#lang racket` and `#lang mzscheme`.
For immutable hashes, `hash-iterate-{key,value}' used to take O(N) time on
the first call for a particular table and O(1) thereafter. Now it takes
O(1) time for all calls, the constant is only slightly larger for
the non-first calls, and there's no extra allocation.
This is a bit suspicious, since it isn't clear why a frame
whose show method has been called with #f should be considered
an active frame. Since changing that is a much more dangerous
change then, for now: closes PR 13564
This commit is to giure out just how much Rackety can combat rightward drift
in this file (this was a region of code edited recently for other reasons)
Turns out that the first hunk's rightmost column (of code, not counting
comments) moved left by 39 chars and the second by 40 chars
