Fix: Nicer error message when a station switch returns a SpriteLayout #360
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| @@ -15,7 +15,7 @@ | |||
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| from nml import expression, generic, global_constants, nmlop | |||
| from nml.actions import action2, action2real, action2var_variables, action4, action6, actionD | |||
| from nml.ast import switch | |||
| from nml.ast import general, switch, spriteblock | |||
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Cyclic import Note
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Stations usage of SpriteLayouts is very different to other features, but it may happen an author write a switch returning a SpriteLayout (like it's done for other features).
This triggers this assert, which is not helpful for the author.
A check exist to prevent invalid use of SpriteLayout when following 1/2/3, but stations are allowed to have SpriteLayout with a special handling.
Detect the problem before asserting and output a more useful error message.
Doing the same kind of check for SpriteGroup is not necessary here because it's already handled here and here and all features follow 1/2/3 for SpriteGroups.