What does 'inline' mean?

[Andrei Alexandrescu]

On 6/11/20 9:55 PM, Manu wrote:
> This is another one of those cases is really bizarre resistance to what 
> seems like a blindingly obvious thing.

After perusing this entire thread, I must confess I'm unclear of what 
the request is. I'm sure it's something reasonable, and that the 
misunderstanding is mine.

Can someone summarize what the matter is and what the motivation behind 
it is?

Also, starting from the pragma definition: 
https://dlang.org/spec/pragma.html#inline. It's very thin! There's 
definitely a need to improve it. It would need at least enough detail to 
describe what the linkage of inline function is.