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SOURCE_FILE
FN
FN_KW "fn"
WHITESPACE " "
NAME
IDENT "main"
PARAM_LIST
L_PAREN "("
R_PAREN ")"
WHITESPACE " "
BLOCK_EXPR
STMT_LIST
L_CURLY "{"
WHITESPACE "\n "
LET_STMT
LET_KW "let"
WHITESPACE " "
PAREN_PAT
L_PAREN "("
OR_PAT
NOT_NULL
BANG "!"
IDENT_PAT
NAME
IDENT "a"
WHITESPACE " "
PIPE "|"
WHITESPACE " "
NOT_NULL
BANG "!"
REF_PAT
AMP "&"
LITERAL_PAT
LITERAL
INT_NUMBER "0"
R_PAREN ")"
WHITESPACE " "
EQ "="
WHITESPACE " "
TUPLE_EXPR
L_PAREN "("
R_PAREN ")"
SEMICOLON ";"
WHITESPACE "\n"
R_CURLY "}"
WHITESPACE "\n"