SOURCE_FILE
FN
FN_KW "fn"
WHITESPACE " "
NAME
IDENT "foo"
PARAM_LIST
L_PAREN "("
R_PAREN ")"
WHITESPACE " "
BLOCK_EXPR
STMT_LIST
L_CURLY "{"
WHITESPACE "\n "
EXPR_STMT
YIELD_EXPR
YIELD_KW "yield"
SEMICOLON ";"
WHITESPACE "\n "
EXPR_STMT
YIELD_EXPR
YIELD_KW "yield"
WHITESPACE " "
LITERAL
INT_NUMBER "1"
SEMICOLON ";"
WHITESPACE "\n"
R_CURLY "}"
WHITESPACE "\n"