• biocyberman (11/11) May 24 2018 I am testing with DMD 2.078.2 locally. This tiny snippet works on
• rikki cattermole (2/17) May 24 2018 https://docarchives.dlang.io/v2.078.0/phobos/std_algorithm_mutation.html...
• Steven Schveighoffer (37/56) May 24 2018 This doesn't quite tell the whole story.
• biocyberman (16/73) May 24 2018 @Rikki and Steve: Many thanks for the good tips. I upgraded to

biocyberman <biocyberman gmail.com> writes:

I am testing with DMD 2.078.2 locally. This tiny snippet works on 
dlang's online editor: https://run.dlang.io/is/nb4IV4

But it does not work on my local dmd.

import std.algorithm.mutation;
import std.stdio;
char[] arr = "hello\U00010143\u0100\U00010143".dup;
writeln(arr.reverse);

Error: template std.stdio.writeln cannot deduce function from 
argument types !()(void)

The document says reverse returns a range: 
https://dlang.org/phobos/std_algorithm_mutation.html#reverse

rikki cattermole <rikki cattermole.co.nz> writes:

On 25/05/2018 12:06 AM, biocyberman wrote:
 I am testing with DMD 2.078.2 locally. This tiny snippet works on 
 dlang's online editor: https://run.dlang.io/is/nb4IV4
 
 But it does not work on my local dmd.
 
 import std.algorithm.mutation;
 import std.stdio;
 char[] arr = "hello\U00010143\u0100\U00010143".dup;
 writeln(arr.reverse);
 
 Error: template std.stdio.writeln cannot deduce function from argument 
 types !()(void)
 
 The document says reverse returns a range: 
 https://dlang.org/phobos/std_algorithm_mutation.html#reverse

https://docarchives.dlang.io/v2.078.0/phobos/std_algorithm_mutation.html#reverse

Steven Schveighoffer <schveiguy yahoo.com> writes:

On 5/24/18 8:08 AM, rikki cattermole wrote:
 On 25/05/2018 12:06 AM, biocyberman wrote:
 I am testing with DMD 2.078.2 locally. This tiny snippet works on 
 dlang's online editor: https://run.dlang.io/is/nb4IV4

 But it does not work on my local dmd.

 import std.algorithm.mutation;
 import std.stdio;
 char[] arr = "hello\U00010143\u0100\U00010143".dup;
 writeln(arr.reverse);

 Error: template std.stdio.writeln cannot deduce function from argument 
 types !()(void)

 The document says reverse returns a range: 
 https://dlang.org/phobos/std_algorithm_mutation.html#reverse

 
 https://docarchives.dlang.io/v2.078.0/phobos/std_algorithm_m
tation.html#reverse 
 

This doesn't quite tell the whole story.

An array used to have a .reverse property that the compiler implemented, 
which returned the array after reversing it. So in history, this 
actually worked without std.algorithm.

You get a nice history of what happens using "all dmd versions" on 
run.dlang.io. If you remove the "mutation" part from the import, you get:

Up to      2.071.2: Success with output: 𐅃Ā𐅃olleh
2.072.2 to 2.074.1: Success with output:
-----
onlineapp.d(6): Deprecation: use std.algorithm.reverse instead of 
.reverse property
𐅃Ā𐅃olleh
-----

            2.075.1: Failure with output:
-----
onlineapp.d(6): Error: template std.stdio.writeln cannot deduce function 
from argument types !()(void), candidates are:
/path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/stdio.d(3553): 
       std.stdio.writeln(T...)(T args)
-----

2.076.1 to 2.077.1: Failure with output:
-----
onlineapp.d(6): Error: template std.stdio.writeln cannot deduce function 
from argument types !()(void), candidates are:
/path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/stdio.d(3571): 
       std.stdio.writeln(T...)(T args)
-----

            2.078.1: Failure with output:
-----
onlineapp.d(6): Error: template std.stdio.writeln cannot deduce function 
from argument types !()(void), candidates are:
/path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/stdio.d(3657): 
       std.stdio.writeln(T...)(T args)
-----

Since      2.079.0: Success with output: 𐅃Ā𐅃olleh

-Steve

biocyberman <biocyberman gmail.com> writes:

On Thursday, 24 May 2018 at 12:34:38 UTC, Steven Schveighoffer 
wrote:
 On 5/24/18 8:08 AM, rikki cattermole wrote:
 On 25/05/2018 12:06 AM, biocyberman wrote:
 I am testing with DMD 2.078.2 locally. This tiny snippet 
 works on dlang's online editor: https://run.dlang.io/is/nb4IV4

 But it does not work on my local dmd.

 import std.algorithm.mutation;
 import std.stdio;
 char[] arr = "hello\U00010143\u0100\U00010143".dup;
 writeln(arr.reverse);

 Error: template std.stdio.writeln cannot deduce function from 
 argument types !()(void)

 The document says reverse returns a range: 
 https://dlang.org/phobos/std_algorithm_mutation.html#reverse

 
 https://docarchives.dlang.io/v2.078.0/phobos/std_algorithm_mutation.html#reverse
 

 This doesn't quite tell the whole story.

 An array used to have a .reverse property that the compiler 
 implemented, which returned the array after reversing it. So in 
 history, this actually worked without std.algorithm.

 You get a nice history of what happens using "all dmd versions" 
 on run.dlang.io. If you remove the "mutation" part from the 
 import, you get:

 Up to      2.071.2: Success with output: 𐅃Ā𐅃olleh
 2.072.2 to 2.074.1: Success with output:
 -----
 onlineapp.d(6): Deprecation: use std.algorithm.reverse instead 
 of .reverse property
 𐅃Ā𐅃olleh
 -----

            2.075.1: Failure with output:
 -----
 onlineapp.d(6): Error: template std.stdio.writeln cannot deduce 
 function from argument types !()(void), candidates are:
 /path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/stdio.d(3553):
       std.stdio.writeln(T...)(T args)
 -----

 2.076.1 to 2.077.1: Failure with output:
 -----
 onlineapp.d(6): Error: template std.stdio.writeln cannot deduce 
 function from argument types !()(void), candidates are:
 /path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/stdio.d(3571):
       std.stdio.writeln(T...)(T args)
 -----

            2.078.1: Failure with output:
 -----
 onlineapp.d(6): Error: template std.stdio.writeln cannot deduce 
 function from argument types !()(void), candidates are:
 /path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/stdio.d(3657):
       std.stdio.writeln(T...)(T args)
 -----

 Since      2.079.0: Success with output: 𐅃Ā𐅃olleh

 -Steve

 Rikki and Steve: Many thanks for the good tips. I upgraded to 
dmd.2.080.0 now, but the server seems to be very slow. It's 
another story anyway.

  % ./install.sh dmd                                               
                                                                   
                                                                   
                                                                   
                                               !9767
Downloading and unpacking 
http://downloads.dlang.org/releases/2.x/2.080.0/dmd.2.080.0.linux.tar.xz

curl: (28) Operation too slow. Less than 1024 bytes/sec 
transferred the last 30 seconds
Failed to download 
'http://downloads.dlang.org/releases/2.x/2.080.0/dmd.2.080.0.linux.tar.xz'