List of crates whose latest version has a feature prefixed with "no_"

crates-with-negative-features.txt

As of Jan 3, 2017

              approx:0.1.1    -- ['no_std']
               ascii:0.7.1    -- ['no_std']
              bitmap:3.1.3    -- ['no_std']
                cbuf:0.1.1    -- ['no_std']
cmdline_words_parser:0.0.2    -- ['no_std']
              defrag:0.1.3    -- ['no_std']
      discrimination:0.0.0    -- ['no_std']
            dpc-cbuf:0.0.1    -- ['no_std']
      encode_unicode:0.2.0    -- ['ascii_no_std', 'no_std']
                 gif:0.9.0    -- ['raii_no_panic']
         lazy_static:0.2.2    -- ['spin_no_std']
          libbindgen:0.1.5    -- ['assert_no_dangling_items']
    linked-tail-list:0.0.1    -- ['test_no_validate']
                 lzw:0.10.0   -- ['raii_no_panic']
        mitochondria:1.1.2    -- ['no_std']
                mopa:0.2.2    -- ['no_std_examples', 'no_std']
              mucell:0.3.5    -- ['no_std']
                plru:0.1.0    -- ['no_std']
        quickercheck:0.2.0    -- ['no_function_casts']
              ralloc:1.0.0    -- ['unsafe_no_mutex_lock', 'no_log_lock']
               rscam:0.5.3    -- ['no_wrapper']
            sdl2-sys:0.27.2   -- ['no_std']
             typenum:1.5.1    -- ['no_std']
       unicode_names:0.1.7    -- ['no_std']
unicode-segmentation:1.0.1    -- ['no_std']
       unicode-width:0.1.4    -- ['no_std']
         unicode-xid:0.0.4    -- ['no_std']
             va_list:0.1.0    -- ['no_std']

find_bad_features.py

#!/usr/bin/env python3

# There are no bad crates, only crates with bad feature names...

# Run using this command:
#     find crates.io-index -type f -exec tail -n1 '{}' ';' | ./find_bad_features.py | sort

import json
import pprint
import sys

if __name__ == '__main__':
    for line in sys.stdin:
        crate = json.loads(line)
        bad_features = [feature for feature in crate['features'] if 'no_' in feature]
        if bad_features:
            print('{name:>20}:{vers:<8} -- {bad_features}'
                    .format(bad_features=bad_features, **crate))