User-defined literal suffixes: Grammar

docs/grammar/SolidityLexer.g4

@@ -85,6 +85,7 @@ SignedIntegerType:
 Storage: 'storage';
 String: 'string';
 Struct: 'struct';
+Suffix: 'suffix';
 True: 'true';
 Try: 'try';
 Type: 'type';

docs/grammar/SolidityParser.g4

@@ -182,7 +182,8 @@ locals[
  freeFunctionDefinition:
  	Function (identifier | Fallback | Receive)
  	LParen (arguments=parameterList)? RParen
- 	stateMutability?
+ 	stateMutability? Suffix?
+ 	| Suffix? stateMutability?
  	(Returns LParen returnParameters=parameterList RParen)?
  	(Semicolon | body=block);
 
@@ -406,6 +407,7 @@ expression:
 		identifier
 		| literal
 		| literalWithSubDenomination
+		| suffixedLiteral
 		| elementaryTypeName[false]
 	  ) # PrimaryExpression
 ;
@@ -421,12 +423,14 @@ inlineArrayExpression: LBrack (expression ( Comma expression)* ) RBrack;
 /**
  * Besides regular non-keyword Identifiers, some keywords like 'from' and 'error' can also be used as identifiers.
  */
-identifier: Identifier | From | Error | Revert | Global;
+identifier: Identifier | From | Error | Revert | Global | Suffix;
 
 literal: stringLiteral | numberLiteral | booleanLiteral | hexStringLiteral | unicodeStringLiteral;
 
 literalWithSubDenomination: numberLiteral SubDenomination;
 
+suffixedLiteral: literal identifier (Period identifier)*;
+
 booleanLiteral: True | False;
 /**
  * A full string literal consists of either one or several consecutive quoted strings.