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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0001284||OCaml||OCaml general||public||2002-07-31 07:22||2012-06-09 13:07|
|Target Version||Fixed in Version||3.11.0|
|Summary||0001284: Fix offered for "illegal stream concatenation" in Stream|
|Description||The documentation in Stream.mli says:|
Warning: these functions create streams with fast access; it is illegal
to mix them with streams built with [[< >]]; would raise [Failure]
when accessing such mixed streams.
As an example of this, the following code fails:
npeek 20 (iapp (of_string "as") (icons 'z' (of_list ['d'; 'f'])));;
(This is an artificial example. The actual example that motivated me
has since been replaced by a workaround, so I don't have it
The resolution of bug 235 at
reaffirms that this behavior is considered acceptable, but it doesn't make
sense to regard throwing an exception as better than computing a useful result.
I found it frustrating that the compiler wouldn't help me predict when a stream
operation would fail with the "illegal stream concatenation" error, so I
rewrote stream.ml so all streams are valid inputs to all stream operations that
take streams as arguments.
I plugged it into the ocaml source from anonymous CVS and the compiler
was able to bootstrap fine. It also passes a fairly thorough unit
test that's in the comments at the end, and it has reasonable
performance according to the benchmark at the end of the test cases.
Is there any interest in incorporating this changed code into OCAML?
The revised .ml file is at
and the .mli file (which is identical to the old version, except for a few
comments) is at
As indicated by the header at the beginning of stream_fixed.ml, I'm happy to
assign copyright on the rewritten file to INRIA if it gets incorporated into
GPG public key fingerprint ECDF 46F8 3B80 BB9E 575D 7180 76DF FE00 34B1 5C78
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This restriction was removed in 3.11.0 and the example now works (tested in 3.12.1). I am updating the documentation (stream.mli) by removing the paragraph in question.
Problem fixed in 3.11.0 (commit 8893), documentation fixed in trunk (3.13.0) (commit 12077).
|2005-11-18 10:13||administrator||New Issue|
|2012-01-25 15:50||doligez||Note Added: 0006797|
|2012-01-25 15:50||doligez||Status||acknowledged => closed|
|2012-01-25 15:50||doligez||Resolution||open => fixed|
|2012-01-25 15:50||doligez||Fixed in Version||=> 3.11.0|
|2012-01-25 15:50||doligez||Description Updated||View Revisions|
|2012-01-25 15:55||doligez||Relationship added||parent of 0001289|
|2012-06-09 13:07||gasche||Relationship added||related to 0005644|
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