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[Kagamin]

Like typedef alias supports multiple declarators.
aliasDeclaration:
'alias' (aliasInitializer (',' aliasInitializer)* | type 
declarator (',' declarator)*) ';'

Also declarator supports initializer, but alias doesn't.
declarator:
     Identifier ('=' initializer)?
     ;

alias int a=1;
Error: alias cannot have initializer