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doc: Rewrite section on error handling in libraries 

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
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Matthias Beyer 2019-04-26 16:15:34 +02:00
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doc/src/03010-conventions.md
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@ -63,12 +63,8 @@ think hard whether this is really necessary.
### Library error types/kinds
Libraries must use "error-chain" to create error types and kinds.
Most likely, a library needs some kinds for wrapping the errors from underlying
libraries, such as the store itself.
Libraries must use "failure" to create error objects.
A library must _never_ introduce multiple error types, but is free to introduce
as many error kinds as required.
### Libraries with commandline frontends