elseIfBlock function
Implementation
Parser elseIfBlock() => seq2(ref0(elsifTag), ref0(elsifBranchContent))
.map((values) {
final elsifTag = values.$1 as Tag;
final elsifBody = (values.$2 as List).cast<ASTNode>();
return elsifTag.copyWith(body: elsifBody);
})
.labeled('elseIfBlock');