On Tuesday, 14 November 2023 at 13:58:17 UTC, Paul Backus wrote:
On Tuesday, 14 November 2023 at 13:41:32 UTC, Steven
Schveighoffer wrote:
```
Error: copy constructor `testinoutctor.S1.this(ref const(S1)
s) const` is not callable using argument types `(const(S1))`
```
I'm not sure what this means. There shouldn't be a copy being
made here, as the thing is already const. I don't understand
this error, and it looks like a bug to me.
The error is saying that the copy constructor expects a `const`
`this` argument, but you're passing a mutable `this` argument.
Thanks for explaining, it's a confusing error.
The error when the constructor is changed to be immutable is:
```
Error: `immutable` method `immutable_ctor.S1.this` is not
callable using a mutable object
```
(I've made a fix to say constructor instead of method for that.)
Now I've made a fix to produce a similar error for const:
https://issues.dlang.org/show_bug.cgi?id=24248
