Replace some std::iter::repeat with str::repeat

Author: r00ster91

clippy_lints/src/mem_discriminant.rs

@@ -7,7 +7,6 @@ use rustc_errors::Applicability;
 use rustc_hir::{BorrowKind, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
-use std::iter;
 
 declare_clippy_lint! {
  /// **What it does:** Checks for calls of `mem::discriminant()` on a non-enum type.
@@ -67,7 +66,7 @@ impl<'tcx> LateLintPass<'tcx> for MemDiscriminant {
  }
  }
 
- let derefs: String = iter::repeat('*').take(derefs_needed).collect();
+ let derefs = "*".repeat(derefs_needed);
  diag.span_suggestion(
  param.span,
  "try dereferencing",

clippy_lints/src/methods/clone_on_copy.rs

@@ -8,7 +8,6 @@ use rustc_hir::{BindingAnnotation, Expr, ExprKind, MatchSource, Node, PatKind};
 use rustc_lint::LateContext;
 use rustc_middle::ty::{self, adjustment::Adjust};
 use rustc_span::symbol::{sym, Symbol};
-use std::iter;
 
 use super::CLONE_DOUBLE_REF;
 use super::CLONE_ON_COPY;
@@ -54,8 +53,8 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, method_name: Symbol,
  ty = inner;
  n += 1;
  }
- let refs: String = iter::repeat('&').take(n + 1).collect();
- let derefs: String = iter::repeat('*').take(n).collect();
+ let refs = "&".repeat(n + 1);
+ let derefs = "*".repeat(n);
  let explicit = format!("<{}{}>::clone({})", refs, ty, snip);
  diag.span_suggestion(
  expr.span,