Hard to understand error when compiler is not last element of specification

[rikkimax]

System information

• dub version: 1.36.0-1+b3
• OS Platform and distribution: Linux
• compiler version ldc 1.36.0

Bug Description

A user on Discord encountered this issue.

They had a hard time understanding this error message.

dub/source/dub/platform.d

Line 232 in 0699f67

enforce(splitted.empty, "No valid specification! The compiler has to be the last element: " ~ specification);

It would be good to expand upon on it and perhaps give an example in it.

How to reproduce?

Use specification ldc-linux.

Expected Behavior

A better error message.

Logs