• zoujiaqing (19/19) May 13 2022 ```bash
• Steven Schveighoffer (8/30) May 13 2022 What writeln? Your compile trace is missing the original call line, and
• Steven Schveighoffer (7/10) May 13 2022 Looking at your last commit, I figured it out:
• zoujiaqing (3/13) May 13 2022 Thank you my friend.

zoujiaqing <zoujiaqing gmail.com> writes:

```bash
% git clone https://github.com/kerisy/archttp.git
% cd archttp/
% dub build --compiler=dmd
Performing "debug" build using dmd for x86_64.
archttp 0.0.1+commit.3.g70d44ef: building configuration 
"library"...
../../.dub/packages/nbuff-0.1.14/nbuff/source/nbuff/buffer.d(74,25):
Deprecation: `catch` statement without an exception specification is deprecated
../../.dub/packages/nbuff-0.1.14/nbuff/source/nbuff/buffer.d(74,25):        use
`catch(Throwable)` for old behavior
SSE: false
/opt/dmd/osx/bin/../../src/phobos/std/stdio.d(5190,5): Error: 
variable `impl` cannot be modified at compile time
/opt/dmd/osx/bin/../../src/phobos/std/stdio.d(4130,12):        
called from here: `makeGlobal()`
/opt/dmd/osx/bin/../../src/phobos/std/stdio.d(4220,18):        
called from here: `trustedStdout()`
```

Why can't we use writeln in constructors?
Comment out writeln so that the code will compile properly!

Steven Schveighoffer <schveiguy gmail.com> writes:

On 5/13/22 3:39 PM, zoujiaqing wrote:
 ```bash
 % git clone https://github.com/kerisy/archttp.git
 % cd archttp/
 % dub build --compiler=dmd
 Performing "debug" build using dmd for x86_64.
 archttp 0.0.1+commit.3.g70d44ef: building configuration "library"...
 ../../.dub/packages/nbuff-0.1.14/nbuff/source/nbuff/buffer.d(74,25): 
 Deprecation: `catch` statement without an exception specification is 
 deprecated
 ../../.dub/packages/nbuff-0.1.14/nbuff/source/nbuff/buffer.d(74,25):        
 use `catch(Throwable)` for old behavior
 SSE: false
 /opt/dmd/osx/bin/../../src/phobos/std/stdio.d(5190,5): Error: variable 
 `impl` cannot be modified at compile time
 /opt/dmd/osx/bin/../../src/phobos/std/stdio.d(4130,12): called from 
 here: `makeGlobal()`
 /opt/dmd/osx/bin/../../src/phobos/std/stdio.d(4220,18): called from 
 here: `trustedStdout()`
 ```
 
 Why can't we use writeln in constructors?
 Comment out writeln so that the code will compile properly!

What writeln? Your compile trace is missing the original call line, and 
I would say probably more.

 From what you are saying, it appears that you are calling writeln 
inside a constructor, and you are attempting to build an instance of the 
object at compile time.

Instead of commenting out the writeln, maybe gate it with `if(!__ctfe)`.

-Steve

Steven Schveighoffer <schveiguy gmail.com> writes:

On 5/13/22 3:46 PM, Steven Schveighoffer wrote:
 
 What writeln? Your compile trace is missing the original call line, and 
 I would say probably more.

Looking at your last commit, I figured it out:

https://github.com/kerisy/archttp/blob/545b3eb738261e92c88b4e4bb664b4fdfb206398/source/archttp/codec/HttpDecoder.d#L31

That's where you are attempting to build an HttpRequestParser at compile 
time.

Just use the `__ctfe` trick.

-Steve

zoujiaqing <zoujiaqing gmail.com> writes:

On Friday, 13 May 2022 at 19:48:04 UTC, Steven Schveighoffer 
wrote:
 On 5/13/22 3:46 PM, Steven Schveighoffer wrote:
 
 What writeln? Your compile trace is missing the original call 
 line, and I would say probably more.

 Looking at your last commit, I figured it out:

 https://github.com/kerisy/archttp/blob/545b3eb738261e92c88b4e4bb664b4fdfb206398/source/archttp/codec/HttpDecoder.d#L31

 That's where you are attempting to build an HttpRequestParser 
 at compile time.

 Just use the `__ctfe` trick.

 -Steve

Thank you my friend.