Add lint for digit grouping.

clippy_lints/src/lib.rs

@@ -101,6 +101,7 @@ pub mod large_enum_variant;
 pub mod len_zero;
 pub mod let_if_seq;
 pub mod lifetimes;
+pub mod literal_digit_grouping;
 pub mod loops;
 pub mod map_clone;
 pub mod matches;
@@ -316,6 +317,7 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry) {
     reg.register_late_lint_pass(box large_enum_variant::LargeEnumVariant::new(conf.enum_variant_size_threshold));
     reg.register_late_lint_pass(box should_assert_eq::ShouldAssertEq);
     reg.register_late_lint_pass(box needless_pass_by_value::NeedlessPassByValue);
+    reg.register_early_lint_pass(box literal_digit_grouping::LiteralDigitGrouping);
 
     reg.register_lint_group("clippy_restrictions", vec![
         arithmetic::FLOAT_ARITHMETIC,
@@ -418,6 +420,9 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry) {
         let_if_seq::USELESS_LET_IF_SEQ,
         lifetimes::NEEDLESS_LIFETIMES,
         lifetimes::UNUSED_LIFETIMES,
+        literal_digit_grouping::UNREADABLE_LITERAL,
+        literal_digit_grouping::INCONSISTENT_DIGIT_GROUPING,
+        literal_digit_grouping::LARGE_DIGIT_GROUPS,
         loops::EMPTY_LOOP,
         loops::EXPLICIT_COUNTER_LOOP,
         loops::EXPLICIT_INTO_ITER_LOOP,