• Freddy (10/10) Nov 28 2014 ----
• ketmar via Digitalmars-d-learn (2/4) Nov 28 2014
• Jonathan M Davis via Digitalmars-d-learn (9/19) Nov 29 2014 Well, as the error message says, writeln isn't @safe. It's @system. Now,...
• bearophile (4/15) Nov 29 2014 With the latest dmd compiler this compiles fine.

"Freddy" <Hexagonalstar64 gmail.com> writes:

----
import std.stdio;
 safe:
void main()
{
	writeln("Edit source/app.d to start your project.");
}

----
source/app.d(5): Error: safe function 'D main' cannot call system
function 'std.stdio.writeln!(string).writeln'

ketmar via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:

'cause `writeln`() is not  safe, as you can read in the following
compiler message:

 source/app.d(5): Error: safe function 'D main' cannot call system
 function 'std.stdio.writeln!(string).writeln'

Jonathan M Davis via Digitalmars-d-learn writes:

On Saturday, November 29, 2014 07:24:55 Freddy via Digitalmars-d-learn wrote:
 ----
 import std.stdio;
  safe:
 void main()
 {
   writeln("Edit source/app.d to start your project.");
 }

 ----
 source/app.d(5): Error: safe function 'D main' cannot call system
 function 'std.stdio.writeln!(string).writeln'

Well, as the error message says, writeln isn't  safe. It's  system. Now, in
this case, writeln really should be inferred as  safe, but it looks like
whatever work needs to be done to make it so that writeln is treated as
 safe when it can be hasn't been done yet (whether it can be or not depends
on what's passed to it, so implementing that properly could be rather
complicated, but mainly, the issue is that someone needs to take the time to
do it).

- Jonathan M Davis

"bearophile" <bearophileHUGS lycos.com> writes:

Freddy:

 ----
 import std.stdio;
  safe:
 void main()
 {
 	writeln("Edit source/app.d to start your project.");
 }

 ----
 source/app.d(5): Error: safe function 'D main' cannot call 
 system
 function 'std.stdio.writeln!(string).writeln'

With the latest dmd compiler this compiles fine.

Bye,
bearophile