[Bug] Overflow in mesh constructor

[ancaandrei]

Describe the bug
Error 'IndxBnds': Index out of bounds.
in AreaMesh at line 82
from global at line 9

To Reproduce
Steps to reproduce the behavior:

1. Go to '../morpho/examples/cholesteric/cholesteric.morpho'
2. Change dx to dx = 0.00000000001
3. Run morpho5 cholesteric.morpho
4. See error

Expected behavior
Error should not be there or the error should say that the mesh has an upper bound.

Screenshots
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Additional context
Add any other context about the problem here.

[softmattertheory]

What's the status of this?

[ConduitDan]

I have not yet started debugging this issue

[softmattertheory]

Great can you de-assign yourself @ConduitDan and reassign when you're actively working on it. It may be something I jump in on (it's a minor error really...)

[ConduitDan]

So i think what we need to do is add range count checking to the functions in mesh builder.
What is the current preferred method if the check fails. I don't think there is a way of throwing an error yet.

[ConduitDan]

I'll start with a printed error with a return nil

[softmattertheory]

Agreed @ConduitDan I think this needs 0.6 and error raising...

[ConduitDan]

We've got error raising now! I'm assigning to me!

[softmattertheory]

Woohoo error raising!

[ConduitDan]

Revisiting this

[softmattertheory]

Thanks so much @ancaandrei for originally raising this issue. It's taken a while to get to—custom errors arrived in 0.6—but PR #287 has now fixed the issue and a test is in place. The fix will be forthcoming in v0.6.2. Thankyou again for your contribution!