[mercury-users] List literals are falsely treated as being unique

[Michael Day]

Hi,

Mercury will accept that the literal list [1,2,3] is unique and allow me 
to pass it to a predicate that accepts lists with mode di.

However, the list is stored as static data, in a non-writable page, so 
the program will segfault if the list is actually modified.

This is similar to the issue affecting set_char on strings.

Summary: OUCH! Any program that performs destructive update on lists is 
only one accidentally passed constant away from disaster.

Cheers,

Michael

-- 
Print XML with Prince!
http://www.princexml.com
--------------------------------------------------------------------------
mercury-users mailing list
Post messages to:       mercury-users at csse.unimelb.edu.au
Administrative Queries: owner-mercury-users at csse.unimelb.edu.au
Subscriptions:          mercury-users-request at csse.unimelb.edu.au
--------------------------------------------------------------------------