Factors that prevent implicit conversions to be found

Hi,

in the akka-http/spray routing DSL there's a case where an implicit
conversion isn't found in some cases (mostly deterministic per compile
run) for this line:

parameter('color)

where parameter's argument should be of type `ParamMagnet` and the
implicit conversion is defined in ParamMagnet's companion object.

There's quite some logic involved behind the scenes to convert a
Symbol to a ParamMagnet implicit. The strange thing is that you can
make it compile by adding a line just mentioning the type
`ParamMagnet` above the problematic line:

e.g.

type X = akka.http.scaladsl.server.directives.ParameterDirectives.ParamMagnet
parameter('color)

or

val x: akka.http.scaladsl.server.directives.ParameterDirectives.ParamMagnet
= null
parameter('color)


Adding the line below the problematic one doesn't help. I know it's
not the first time I had such an issue but I cannot remember if I
found a solution or not before.

`-Xlog-implicits` doesn't show anything. The compilation problem
occurs with Scala 2.10.x.

Any ideas?

Thanks,
Johannes

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