Lint overlapping_ranges_endpoints directly instead of collecting into a Vec
          #120002
        
          
      
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In #119396 I was a bit silly: I was trying to avoid any lints being fired from within the exhaustiveness algorithm for some vague aesthetic/reusability reason that doesn't really hold. This PR fixes that: instead of passing a
&mut Vecaround I just added a method to theTypeCxtrait.r? @compiler-errors