Commits on May 10, 2018

1. library: mark more functions that return String as #[must_use] …

   If the return value (String) of the function is not used, the function call is technically in vain
   (unless there are side effects) and the entire function call could be ommitted.
   
   Warn about unused return values of -> String functions.
   
   Example code:
   
      let mut x = Sting::from("hello");
      x.push_str(" world!");
      x.to_uppercase();
      println!("{}", x);
   
   will print "hello world!" instead of "HELLO WORLD!") because the result of .to_uppercase() is not caught
   in a variable.
   
   std::str::to_lowercase()
   std::str::to_uppercase()
   std::str::escape_debug()
   std::str::escape_default()
   std::str::escape_unicode()
   std::str::into_string()
   std::str::repeat()
   std::str::to_ascii_uppercase()
   std::str::to_ascii_lowercase()
   
   std::String::with_capacity()
   std::String::from_str()
   std::String::from_utf16_lossy()
   std::String::from_raw_parts()
   std::String::from_utf8_unchecked()
   std::String::split_off()

   

   matthiaskrgr committed May 10, 2018
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