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.

scripts/test_antlr_grammar.sh

@@ -129,7 +129,8 @@ done < <(
       grep -v -E 'license/license_hidden_unicode.sol' |
       grep -v -E 'license/license_unicode.sol' |
       # Skipping tests with 'something.address' as 'address' as the grammar fails on those
-      grep -v -E 'inlineAssembly/external_function_pointer_address.*.sol'
+      grep -v -E 'inlineAssembly/external_function_pointer_address.*.sol' |
+      grep -v -E 'literalSuffixes/application/invalid_address_member_on_suffix.sol'
 )
 
 YUL_FILES=()