Don't try to eagerly parse inline

Author: natsukagami

compiler/src/dotty/tools/dotc/parsing/Parsers.scala

@@ -3253,14 +3253,14 @@ object Parsers {
               val firstParamMod =
                 var mods = EmptyModifiers
                 if isErased then mods = addModifier(mods)
-                if in.name == nme.inline then mods = addModifier(mods)
+                // if in.name == nme.inline then mods = addModifier(mods)
                 mods
               if givenOnly && !impliedMods.is(Given) then
                 syntaxError(em"`using` expected")
               val isParams =
                 !impliedMods.is(Given)
                 || startParamTokens.contains(in.token)
-                || isIdent && in.lookahead.isColon
+                || isIdent && (in.name == nme.inline || in.lookahead.isColon)
               (if isParams then commaSeparated(() => param())
               else contextTypes(ofClass, nparams, impliedMods)) match {
                 case Nil => Nil