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Re: [Chicken-users] Segmentation violation with chicken 5.1.0
From: |
Peter Bex |
Subject: |
Re: [Chicken-users] Segmentation violation with chicken 5.1.0 |
Date: |
Sun, 23 Jun 2019 14:51:21 +0200 |
User-agent: |
NeoMutt/20170113 (1.7.2) |
On Sun, Jun 23, 2019 at 02:33:10PM +0200, Peter Bex wrote:
> [panic] Low-level type assertion
> C_blockp((C_word)C_VAL1(C__PREV_TMPST.n1))=#t failed at chickenprob3.c:93488
> - execution terminated
Here's a minimal reproducible testcase:
(define (test-it)
(let loop ((done #f))
(if done
'()
(cons (or (read) 0.0) (loop #t)))))
(print (test-it))
This generates exactly the same construct:
f0=C_flonum_magnitude((C_truep(t1)?t1:lf[1]));
If you type in a fixnum integer, this will break too.
I've filed a bug to track this: https://bugs.call-cc.org/ticket/1624
A quick workaround for your program might be to return the 0.0 from a
foreign lambda, like so:
(define return-zero
(foreign-lambda* float () "C_return(0.0);"))
(define (test-it)
(let loop ((done #f))
(if done
'()
(cons (or (read) (return-zero)) (loop #t)))))
(print (test-it))
It's stupid, but it works.
Cheers,
Peter
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