Re: is this a bug with writeln / std.algorithm.remove?

[arturg via Digitalmars-d-learn]

On Friday, 16 February 2018 at 13:57:07 UTC, Steven Schveighoffer 
wrote:


You have a pretty good minimal test, put that in bugzilla along 
with the forum thread link and all the info we know. Mark it as 
a dmd bug, regression, along with the version where it 
regressed (2.076.1), and I would tag it as "rejects-valid"


-Steve


ok done
https://issues.dlang.org/show_bug.cgi?id=18451

Re: is this a bug with writeln / std.algorithm.remove?

[Steven Schveighoffer via Digitalmars-d-learn]

On 2/16/18 8:51 AM, arturg wrote:

On Friday, 16 February 2018 at 13:28:59 UTC, Steven Schveighoffer wrote:


Strictly speaking, this is not necessarily proof that it's in phobos, 
there could have been changes elsewhere that cause one of the 
conditions to fail.


However, testing this out, I found something very weird.

If you pragma(msg, isInputRange!(typeof(dgs))); inside your file, then 
it compiles (and prints true for that pragma).


Makes no sense at all. Definitely seems like a compiler bug. A 
pragma(msg) shouldn't affect the outcome.




ok so what should the bug report look like?


You have a pretty good minimal test, put that in bugzilla along with the 
forum thread link and all the info we know. Mark it as a dmd bug, 
regression, along with the version where it regressed (2.076.1), and I 
would tag it as "rejects-valid"


-Steve

Re: is this a bug with writeln / std.algorithm.remove?

[arturg via Digitalmars-d-learn]

On Friday, 16 February 2018 at 13:28:59 UTC, Steven Schveighoffer 
wrote:


Strictly speaking, this is not necessarily proof that it's in 
phobos, there could have been changes elsewhere that cause one 
of the conditions to fail.


However, testing this out, I found something very weird.

If you pragma(msg, isInputRange!(typeof(dgs))); inside your 
file, then it compiles (and prints true for that pragma).


Makes no sense at all. Definitely seems like a compiler bug. A 
pragma(msg) shouldn't affect the outcome.


-Steve


ok so what should the bug report look like?

Re: is this a bug with writeln / std.algorithm.remove?

[Steven Schveighoffer via Digitalmars-d-learn]

On 2/16/18 8:16 AM, bauss wrote:

On Friday, 16 February 2018 at 13:08:09 UTC, bauss wrote:

On Friday, 16 February 2018 at 12:15:07 UTC, arturg wrote:

On Friday, 16 February 2018 at 11:45:21 UTC, arturg wrote:

this code fails to compile:

    void delegate(void*) dg;
    void delegate(void*)[] dgs = [dg, dg, dg];
    dgs.writeln;
    dgs.remove(1).writeln();

if you comment out dgs.writeln; it works as expected,
it works if you use other types then void*:

    void delegate(int*) dg;
    void delegate(int*)[] dgs = [dg, dg, dg];
    dgs.writeln;
    dgs.remove(1).writeln();


the compiler is DMD64 D Compiler v2.078.2 and the error message is:

/usr/include/dlang/dmd/std/algorithm/mutation.d(1929): Error: 
template std.algorithm.mutation.moveAll cannot deduce function from 
argument types !()(void delegate(void*)[], void delegate(void*)[]), 
candidates are:
/usr/include/dlang/dmd/std/algorithm/mutation.d(1455): 
std.algorithm.mutation.moveAll(InputRange1, InputRange2)(InputRange1 
src, InputRange2 tgt) if (isInputRange!InputRange1 && 
isInputRange!InputRange2 && is(typeof(move(src.front, tgt.front
empty.d(9): Error: template instance 
std.algorithm.mutation.remove!(cast(SwapStrategy)2, void 
delegate(void*)[], int) error instantiating


running all dmd version on run.dlang.io
gives me this output:

Up to  2.075.1: Success with output:
-
[void delegate(void*), void delegate(void*), void delegate(void*)]
[void delegate(void*), void delegate(void*)]
-

Since  2.076.1: Failure with output:
-
/path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/algorithm/mutation.d(1929): 
Error: template std.algorithm.mutation.moveAll cannot deduce function 
from argument types !()(void delegate(void*)[], void 
delegate(void*)[]), candidates are:
/path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/algorithm/mutation.d(1455):
std.algorithm.mutation.moveAll(InputRange1, InputRange2)(InputRange1 
src, InputRange2 tgt) if (isInputRange!InputRange1 && 
isInputRange!InputRange2 && is(typeof(move(src.front, tgt.front
onlineapp.d(7): Error: template instance 
std.algorithm.mutation.remove!(cast(SwapStrategy)2, void 
delegate(void*)[], int) error instantiating

-


It's definitely a bug, the question is what change has caused it.


Looking at "moveAll" which is the one that causes the error, no changes 
has been made to that which could cause this as within the last 3 months 
only changes made to it has been two asserts that has been inserted. 
Other than that has only been a documentation change a year ago and 
prior to that changes hasn't been made to it for 3 years.


So it's a bug in the compiler, rather than Phobos itself.



Strictly speaking, this is not necessarily proof that it's in phobos, 
there could have been changes elsewhere that cause one of the conditions 
to fail.


However, testing this out, I found something very weird.

If you pragma(msg, isInputRange!(typeof(dgs))); inside your file, then 
it compiles (and prints true for that pragma).


Makes no sense at all. Definitely seems like a compiler bug. A 
pragma(msg) shouldn't affect the outcome.


-Steve

Re: is this a bug with writeln / std.algorithm.remove?

[bauss via Digitalmars-d-learn]

On Friday, 16 February 2018 at 13:08:09 UTC, bauss wrote:

On Friday, 16 February 2018 at 12:15:07 UTC, arturg wrote:

On Friday, 16 February 2018 at 11:45:21 UTC, arturg wrote:

this code fails to compile:

void delegate(void*) dg;
void delegate(void*)[] dgs = [dg, dg, dg];
dgs.writeln;
dgs.remove(1).writeln();

if you comment out dgs.writeln; it works as expected,
it works if you use other types then void*:

void delegate(int*) dg;
void delegate(int*)[] dgs = [dg, dg, dg];
dgs.writeln;
dgs.remove(1).writeln();


the compiler is DMD64 D Compiler v2.078.2 and the error 
message is:


/usr/include/dlang/dmd/std/algorithm/mutation.d(1929): Error: 
template std.algorithm.mutation.moveAll cannot deduce 
function from argument types !()(void delegate(void*)[], void 
delegate(void*)[]), candidates are:
/usr/include/dlang/dmd/std/algorithm/mutation.d(1455):
std.algorithm.mutation.moveAll(InputRange1, 
InputRange2)(InputRange1 src, InputRange2 tgt) if 
(isInputRange!InputRange1 && isInputRange!InputRange2 && 
is(typeof(move(src.front, tgt.front
empty.d(9): Error: template instance 
std.algorithm.mutation.remove!(cast(SwapStrategy)2, void 
delegate(void*)[], int) error instantiating


running all dmd version on run.dlang.io
gives me this output:

Up to  2.075.1: Success with output:
-
[void delegate(void*), void delegate(void*), void 
delegate(void*)]

[void delegate(void*), void delegate(void*)]
-

Since  2.076.1: Failure with output:
-
/path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/algorithm/mutation.d(1929):
 Error: template std.algorithm.mutation.moveAll cannot deduce function from 
argument types !()(void delegate(void*)[], void delegate(void*)[]), candidates 
are:
/path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/algorithm/mutation.d(1455):
std.algorithm.mutation.moveAll(InputRange1, InputRange2)(InputRange1 src, InputRange2 tgt) if 
(isInputRange!InputRange1 && isInputRange!InputRange2 && 
is(typeof(move(src.front, tgt.front
onlineapp.d(7): Error: template instance 
std.algorithm.mutation.remove!(cast(SwapStrategy)2, void 
delegate(void*)[], int) error instantiating

-


It's definitely a bug, the question is what change has caused 
it.


Looking at "moveAll" which is the one that causes the error, no 
changes has been made to that which could cause this as within 
the last 3 months only changes made to it has been two asserts 
that has been inserted. Other than that has only been a 
documentation change a year ago and prior to that changes hasn't 
been made to it for 3 years.


So it's a bug in the compiler, rather than Phobos itself.

Re: is this a bug with writeln / std.algorithm.remove?

[bauss via Digitalmars-d-learn]

On Friday, 16 February 2018 at 12:15:07 UTC, arturg wrote:

On Friday, 16 February 2018 at 11:45:21 UTC, arturg wrote:

this code fails to compile:

void delegate(void*) dg;
void delegate(void*)[] dgs = [dg, dg, dg];
dgs.writeln;
dgs.remove(1).writeln();

if you comment out dgs.writeln; it works as expected,
it works if you use other types then void*:

void delegate(int*) dg;
void delegate(int*)[] dgs = [dg, dg, dg];
dgs.writeln;
dgs.remove(1).writeln();


the compiler is DMD64 D Compiler v2.078.2 and the error 
message is:


/usr/include/dlang/dmd/std/algorithm/mutation.d(1929): Error: 
template std.algorithm.mutation.moveAll cannot deduce function 
from argument types !()(void delegate(void*)[], void 
delegate(void*)[]), candidates are:
/usr/include/dlang/dmd/std/algorithm/mutation.d(1455):
std.algorithm.mutation.moveAll(InputRange1, 
InputRange2)(InputRange1 src, InputRange2 tgt) if 
(isInputRange!InputRange1 && isInputRange!InputRange2 && 
is(typeof(move(src.front, tgt.front
empty.d(9): Error: template instance 
std.algorithm.mutation.remove!(cast(SwapStrategy)2, void 
delegate(void*)[], int) error instantiating


running all dmd version on run.dlang.io
gives me this output:

Up to  2.075.1: Success with output:
-
[void delegate(void*), void delegate(void*), void 
delegate(void*)]

[void delegate(void*), void delegate(void*)]
-

Since  2.076.1: Failure with output:
-
/path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/algorithm/mutation.d(1929):
 Error: template std.algorithm.mutation.moveAll cannot deduce function from 
argument types !()(void delegate(void*)[], void delegate(void*)[]), candidates 
are:
/path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/algorithm/mutation.d(1455):
std.algorithm.mutation.moveAll(InputRange1, InputRange2)(InputRange1 src, InputRange2 tgt) if 
(isInputRange!InputRange1 && isInputRange!InputRange2 && 
is(typeof(move(src.front, tgt.front
onlineapp.d(7): Error: template instance 
std.algorithm.mutation.remove!(cast(SwapStrategy)2, void 
delegate(void*)[], int) error instantiating

-


It's definitely a bug, the question is what change has caused it.

Re: is this a bug with writeln / std.algorithm.remove?

[arturg via Digitalmars-d-learn]

On Friday, 16 February 2018 at 11:45:21 UTC, arturg wrote:

this code fails to compile:

void delegate(void*) dg;
void delegate(void*)[] dgs = [dg, dg, dg];
dgs.writeln;
dgs.remove(1).writeln();

if you comment out dgs.writeln; it works as expected,
it works if you use other types then void*:

void delegate(int*) dg;
void delegate(int*)[] dgs = [dg, dg, dg];
dgs.writeln;
dgs.remove(1).writeln();


the compiler is DMD64 D Compiler v2.078.2 and the error message 
is:


/usr/include/dlang/dmd/std/algorithm/mutation.d(1929): Error: 
template std.algorithm.mutation.moveAll cannot deduce function 
from argument types !()(void delegate(void*)[], void 
delegate(void*)[]), candidates are:
/usr/include/dlang/dmd/std/algorithm/mutation.d(1455):
std.algorithm.mutation.moveAll(InputRange1, 
InputRange2)(InputRange1 src, InputRange2 tgt) if 
(isInputRange!InputRange1 && isInputRange!InputRange2 && 
is(typeof(move(src.front, tgt.front
empty.d(9): Error: template instance 
std.algorithm.mutation.remove!(cast(SwapStrategy)2, void 
delegate(void*)[], int) error instantiating


running all dmd version on run.dlang.io
gives me this output:

Up to  2.075.1: Success with output:
-
[void delegate(void*), void delegate(void*), void delegate(void*)]
[void delegate(void*), void delegate(void*)]
-

Since  2.076.1: Failure with output:
-
/path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/algorithm/mutation.d(1929):
 Error: template std.algorithm.mutation.moveAll cannot deduce function from 
argument types !()(void delegate(void*)[], void delegate(void*)[]), candidates 
are:
/path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/algorithm/mutation.d(1455):
std.algorithm.mutation.moveAll(InputRange1, InputRange2)(InputRange1 src, InputRange2 tgt) if 
(isInputRange!InputRange1 && isInputRange!InputRange2 && 
is(typeof(move(src.front, tgt.front
onlineapp.d(7): Error: template instance 
std.algorithm.mutation.remove!(cast(SwapStrategy)2, void 
delegate(void*)[], int) error instantiating

-

is this a bug with writeln / std.algorithm.remove?

[arturg via Digitalmars-d-learn]

this code fails to compile:

void delegate(void*) dg;
void delegate(void*)[] dgs = [dg, dg, dg];
dgs.writeln;
dgs.remove(1).writeln();

if you comment out dgs.writeln; it works as expected,
it works if you use other types then void*:

void delegate(int*) dg;
void delegate(int*)[] dgs = [dg, dg, dg];
dgs.writeln;
dgs.remove(1).writeln();


the compiler is DMD64 D Compiler v2.078.2 and the error message 
is:


/usr/include/dlang/dmd/std/algorithm/mutation.d(1929): Error: 
template std.algorithm.mutation.moveAll cannot deduce function 
from argument types !()(void delegate(void*)[], void 
delegate(void*)[]), candidates are:
/usr/include/dlang/dmd/std/algorithm/mutation.d(1455):
std.algorithm.mutation.moveAll(InputRange1, 
InputRange2)(InputRange1 src, InputRange2 tgt) if 
(isInputRange!InputRange1 && isInputRange!InputRange2 && 
is(typeof(move(src.front, tgt.front
empty.d(9): Error: template instance 
std.algorithm.mutation.remove!(cast(SwapStrategy)2, void 
delegate(void*)[], int) error instantiating