@julienrf I couldn't reproduce this issue from the Scala console either:

```scala
scala> :paste
// Entering paste mode (ctrl-D to finish)

implicit class JSStringQuoter(val sc: StringContext) {
      def j(args: Any*): String = "\"" + sc.s(args: _*) + "\""
    }

// Exiting paste mode, now interpreting.

defined class JSStringQuoter

scala> j"abc"
res0: String = "abc"

scala> j"\"abc\""
<console>:1: error: ';' expected but string literal found.
       j"\"abc\""
               ^
```