Geal / nom / 380

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Pull #111

travis-ci

Allow expressions in field bindings in `chain!`

`ident` is very restricting in sense that it doesn't allow e.g. qualified names:

`foo: module::submodule::my_parser`

Unfortunately, we can't just use `expr` because of '~' operator nearby. We can workaround this by allowing `expr` inside brackets instead, so with this patch the following is legal:

`foo: (module::submodule::my_parser)`

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