nl_tokens: DECLARATION AND STATEMENT TYPE CHECKING
pl_tokens: function checkTypeParameter ( <mask> ) { // Grammar Checking if ( node . expression ) { grammarErrorOnFirstToken ( node . expression , ts . Diagnostics . Type_expected ) ; } checkSourceElement ( node . constraint ) ; if ( produceDiagnostics ) { checkTypeParameterHasIllegalReferencesInConstraint ( node ) ; checkTypeNameIsReserved ( node . name , ts . Diagnostics . Type_parameter_name_cannot_be_0 ) ; } // TODO: Check multiple declarations are identical }