Why does the scripting engine care about whitespace?

[vegard]

This does what I expect it to:

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set $a, "<curname>"; msg "current selected item: $a";

, this does not:

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set $a, "<curname>"; 
msg "current selected item: $a";

Why?
Seems impractical too me, to have to use a variable on the same line that you define and set it.

[TheQwerty]

That's just the way it is harking back to the first days of script files.
You can split it onto multiple lines by indenting lines.

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set $a, "<curname>";
  msg "current selected item: $a";

Don has expressed a desire to move away from this restriction but I don't think it's anytime soon on his roadmap.