On Thursday, 17 January 2019 at 12:38:55 UTC, Adam D. Ruppe wrote:
You need to pass all the modules you use to the compiler, or compile each one at a time and pass the resultant .o files to the linker together.
Marvellous, thanks!(Okay, it was a naive beginner's question. But I can't help thinking that there's a bit of a hole in the documentation shaped around this.)