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kotlinlang

Groovy allows `$` in identifiers (e.g. `A$B` is a valid identifier). Kotlin allows quoted identifiers like ``A$B`` . But <https://kotlinlang.org/spec/syntax-and-grammar.html#identifiers> states that letters are "&lt;any unicode character of classes LL, LM, LO, LT, LU or NL&gt;" and that identifiers are "(_<https://kotlinlang.org/spec/syntax-and-grammar.html#grammar-rule-Letter|Letter>_ | `'_'`) {_<https://kotlinlang.org/spec/syntax-and-grammar.html#grammar-rule-Letter|Letter>_ | `'_'` | _<https://kotlinlang.org/spec/syntax-and-grammar.html#grammar-rule-UnicodeDigit|UnicodeDigit>_} | `'`'` _<https://kotlinlang.org/spec/syntax-and-grammar.html#grammar-rule-QuotedSymbol|QuotedSymbol>_ {_<https://kotlinlang.org/spec/syntax-and-grammar.html#grammar-rule-QuotedSymbol|QuotedSymbol>_} `'`'` ". Does that not mean that e.g. Ⅲ (aka \u2162) - which is part of unicode character class NL - should be a valid identifier?  I just tried but the compiler does not like `val Ⅲ = "roman 3"`.

that's interesting, kotlin doesn't seem to allow it as a identifier part at all. `val _Ⅲ` doesn't work either

yes. Seems the language spec is wrong (or the implementation).  Do you know the best place to bring that to attention?

<https://github.com/Kotlin/kotlin-spec> if it were the spec, but to me it feels like it's the implementation that should be brought into compliance, in which case, <https://youtrack.jetbrains.com/issues/KT> I think?

<https://youtrack.jetbrains.com/issue/KT-50265>