[BUG] Unclosed command literal reports the wrong line

[Mte90]

The biggest issue I get with Amber is that one:

unsafe $echo

echo 123
echo true

That report:

Unclosed command literal
at [unknown]:6:1


5| echo true
6|

So on long scripts find the line with the issue is a very hard job.
It should says "Unclosed command literal started on line 1".

[Ph0enixKM]

This is an Heraclitus issue: https://github.com/amber-lang/heraclitus so that it keeps the position of the opening bracket