Hi

This may be due to Windows, not DMD.

Please see code below (held in test.d):

void main() {
   import std.stdio;

   writeln("Test");
   assert(false, "TestAssert");
}

dmd -i -run test.d
results in both "Test" and the "TestAssert" string (and trace) being routed to screen.

But
dmd -i -run test.d > op.txt
results in only "Test" going into op.txt, the "TestAssert" string (and trace) being routed to screen as before.

I expected both "Test" and the "TestAssert" string (and trace) to go into op.txt.

The idea was to use op.txt as documentation of a successful test of the "TestAssert" string.

Best regards

On Saturday, 31 July 2021 at 12:03:49 UTC, DLearner wrote:

void main() {
   import std.stdio;

   writeln("Test");
   assert(false, "TestAssert");
}

"Test" is written to the standard out stream; "TestAssert" is written to the standard error stream. > only redirects standard out, so the error stream continues to write to the terminal.

Stream redirection depends on your shell. PowerShell docs appear to be here:
https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_redirection?view=powershell-7.1

On Saturday, 31 July 2021 at 12:03:49 UTC, DLearner wrote:

void main() {
   import std.stdio;

   writeln("Test");
   assert(false, "TestAssert");
}

Please read the docs that jfronden referred to.

If you want a quick hack, use this:

    const(char)[] falseAssertMsg(string s){
        writeln(s);
        return "";
    }
    void main() {
       import std.stdio;

       writeln("Test");
       assert(false, falseAssertMsg("TestAssert failed in main()"));
    }

There should be a better way of doing this though.