0. #lang racket
1. (struct bird (name color weight))
2.  
3. (define owl (bird "owl" "brown" 1.2))
4.  
5. (define (print-bird bird)
6.   (match-define (struct struct:bird (name color weight)) bird)
7.   (displayne name))
8.  
9. (print-bird owl)
10.  

=>

eval:4:0: match: struct:bird does not refer to a structure

definition

at: struct:bird

in: (struct struct:bird (name color weight))

print-bird: undefined;

cannot reference an identifier before its definition

in module: 'm