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SOURCE_FILE
FN
FN_KW "fn"
WHITESPACE " "
NAME
IDENT "async_foo"
PARAM_LIST
L_PAREN "("
PARAM
WILDCARD_PAT
UNDERSCORE "_"
COLON ":"
WHITESPACE " "
IMPL_TRAIT_TYPE
IMPL_KW "impl"
WHITESPACE " "
TYPE_BOUND_LIST
TYPE_BOUND
ASYNC_KW "async"
WHITESPACE " "
PATH_TYPE
PATH
PATH_SEGMENT
NAME_REF
IDENT "Fn"
PARENTHESIZED_ARG_LIST
L_PAREN "("
TYPE_ARG
REF_TYPE
AMP "&"
PATH_TYPE
PATH
PATH_SEGMENT
NAME_REF
IDENT "i32"
R_PAREN ")"
R_PAREN ")"
WHITESPACE " "
BLOCK_EXPR
STMT_LIST
L_CURLY "{"
R_CURLY "}"
WHITESPACE "\n"