Named url mappings are treated as error in grails

At the moment named url mapping is treated as assignment with incorrect types:
```
'name' in 'org.codehaus.groovy.grails.web.mapping.DefaultUrlMappingEvaluator.UrlMappingBuilder' cannot be applied to '(['productLink':java.lang.Object])'
```
For this code:
```
name productLink:"/$pr/"{
controller = "index"
}
```
But it definitely works and is totally correct according to grails documentation - [http://docs.grails.org/3.1.1/guide/single.html#namedMappings](http://docs.grails.org/3.1.1/guide/single.html#namedMappings)

---

*Imported from [IDEA-164126](https://youtrack.jetbrains.com/issue/IDEA-164126) · Type: Bug · Votes: 0*
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Start by reproducing the named URL mapping from the issue in the Grails IntelliJ plugin and inspect how the `name productLink:"/$pr/"` expression is typed. Compare the result with the namedMappings documentation; done means this valid mapping is no longer reported as an incorrect assignment or type error.

Written by the indexing model from the issue text.