Programming in D page 295 - disable default constructor

[monkyyy]

On Tuesday, 10 February 2026 at 12:04:05 UTC, Brother Bill wrote:
> When adding an explicit constructor such as ```this(string 
> fileName)```, this is "supposed" to remove the "default" 
> constructor.  Then the developer needs to add back the default 
> constructor.
>
> [...]

```d
import std;
struct foo{
	int i,j;
	this(int a, int b){
		j=a;
		i=b;
	}
}
unittest{
	auto bar=foo(1,2);
	bar=foo(3);
}
```

> Error: constructor `onlineapp.foo.this(int a, int b)` is not 
> callable using argument types `(int)`

working as expected