[FIR] Support 4 diagnostics for pairs of modifiers

In particular, this commit includes:
* Attempt to abstract access to FirSourceElement via FirModifier
* Add more visit functions to DeclarationCheckersDiagnosticComponent
* Add messages+factories for 4 modifier-related errors and warnings
* Introduce FirModifierChecker
This commit is contained in:
FenstonSingel
2020-03-27 02:10:26 +03:00
committed by Mikhail Glukhikh
parent 311a91af79
commit b7d8e879a6
42 changed files with 656 additions and 122 deletions
@@ -4,7 +4,7 @@ interface Allowed
open class NotAllowed
abstract data class Base(val x: Int)
<!INCOMPATIBLE_MODIFIERS!>abstract<!> <!INCOMPATIBLE_MODIFIERS!>data<!> class Base(val x: Int)
class Derived: Base(42)