SOURCE_FILE
FN
FN_KW "fn"
WHITESPACE " "
NAME
IDENT "foo"
PARAM_LIST
L_PAREN "("
PARAM
IDENT_PAT
NAME
IDENT "x"
COLON ":"
WHITESPACE " "
PATH_TYPE
PATH
PATH_SEGMENT
NAME_REF
IDENT "i32"
COMMA ","
WHITESPACE " "
PARAM
IDENT_PAT
NAME
IDENT "y"
R_PAREN ")"
WHITESPACE " "
BLOCK_EXPR
STMT_LIST
L_CURLY "{"
WHITESPACE "\n"
R_CURLY "}"
WHITESPACE "\n"
error 16: missing type for function parameter