Compiler bugs have been so blessedly rare in Racket, maybe there should
be a page on the Web, honoring those who found a compiler bug?
I would nominate Sage and Alexis for this one.
And Matthew, though we'd have to make sure he's not mis-incentivized by
the glory of bug-finding, to start
Thank you all so much! I'm glad it wasn't a huge mystery in the end.
Original Message
On Jun 17, 2020, 9:13 AM, Matthew Flatt wrote:
> Yes, clearly a BC compiler bug --- and probably almost as old as
> Racket. The bug was specific to `set!` on a locally bound variable as
> the
Yes, clearly a BC compiler bug --- and probably almost as old as
Racket. The bug was specific to `set!` on a locally bound variable as
the first subexpression of `begin0`.
I've pushed a repair.
Thanks!
At Wed, 17 Jun 2020 03:35:51 -0500, Alexis King wrote:
> This is quite curious. It appears to
Sorry for the noise: it behaves as you say returning "!", "2", ...
Somehow I paths screwed up and was running CS when I thought I was
running regular (bytecode) Racket.
Sigh!
George
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It seems to work ... i.e. returns # ... in Windows. I tried it in
7.6 and 7.7, both 32 and 64 bit versions. Not near my Linux machine
to try it there.
The expansion in all cases is the same and seems reasonable:
(module count racket
(#%module-begin
(module
This is quite curious. It appears to be a compiler bug. Here’s a very slightly
smaller test case:
#lang racket/base
(define count!
(let ([i 0])
(λ () (begin0
(set! i (add1 i))
(+ i)
(count!)
The fully-expanded program looks fine, so
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