Shapeless 2.3.3 LabelledGeneric returns a curious result when run on the following case class:
scala> case class Foo(`$eq`: Int)
defined class Foo
scala> LabelledGeneric[Foo]
res0: shapeless.LabelledGeneric[Foo]{type Repr = Int with shapeless.labelled.KeyTag[Symbol with shapeless.tag.Tagged[String("=")],Int] :: shapeless.HNil} = shapeless.LabelledGeneric$$anon$1@1ac7dbd3
Note the label returned is literally = instead of $eq.
Is this behaviour a quirk of shapeless or something else? Are there other identifier names that result in weird behaviour?
I require this for MongoDB serialization and this kind of a major headache for me ...
As per Alexey's comment in the Q, this is a 'feature' in Shapeless, because of the way scala/java interop works. The latter is explained in Daniel Spiewak's blot post under "operators and overaloading".
The list of operators, per the blog, that this affects are:
op Compiles To
= $eq
> $greater
< $less
+ $plus
- $minus
* $times
/ div
! $bang
@ $at
# $hash
% $percent
^ $up
& $amp
~ $tilde
? $qmark
| $bar
\ $bslash
: $colon