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rustc should output "fix-its" like clang does. Here are some ideas:
rustc
Incorrect use of numeric literals.
auto i = 0u; i += 3; // suggest "3u"
Use of for where for each was meant.
for
for each
for (v in foo.iter()) // suggest "for each"
Typos on record field names.
fn f(rec(int foo, int bar) r) { ... } f(rec(foo=1, baz=2)); // suggest "bar"