Auto merge of #4840 - flip1995:rollup-jqk3a3i, r=flip1995

Rollup of 5 pull requests

Successful merges:

 - #4730 (Fix check_infinite_loop (while_immutable_condition) by checking for break or return inside loop body)
 - #4766 (Fix false positive in derive_hash_xor_eq)
 - #4811 (Literal Representation Restructure)
 - #4820 (doc: fix the comment above the lint function)
 - #4830 (use more efficient code to generate repeated string)

Failed merges:

r? @ghost

clippy_lints/src/derive.rs

@@ -90,6 +90,7 @@ fn check_hash_peq<'a, 'tcx>(
     if_chain! {
         if match_path(&trait_ref.path, &paths::HASH);
         if let Some(peq_trait_def_id) = cx.tcx.lang_items().eq_trait();
+        if !&trait_ref.trait_def_id().is_local();
         then {
             // Look for the PartialEq implementations for `ty`
             cx.tcx.for_each_relevant_impl(peq_trait_def_id, ty, |impl_id| {

clippy_lints/src/excessive_precision.rs

@@ -1,4 +1,5 @@
 use crate::utils::span_lint_and_sugg;
+use crate::utils::sugg::format_numeric_literal;
 use if_chain::if_chain;
 use rustc::hir;
 use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
@@ -86,8 +87,7 @@ impl ExcessivePrecision {
             if sym_str == s {
                 None
             } else {
-                let di = super::literal_representation::DigitInfo::new(&s, true);
-                Some(di.grouping_hint())
+                Some(format_numeric_literal(&s, None, true))
             }
         } else {
             None