rescope temp lifetime in let-chain into IfElse

apply rules by span edition

compiler/rustc_lint/src/lib.rs

@@ -56,6 +56,7 @@ mod expect;
 mod for_loops_over_fallibles;
 mod foreign_modules;
 pub mod hidden_unicode_codepoints;
+mod if_let_rescope;
 mod impl_trait_overcaptures;
 mod internal;
 mod invalid_from_utf8;
@@ -94,6 +95,7 @@ use drop_forget_useless::*;
 use enum_intrinsics_non_enums::EnumIntrinsicsNonEnums;
 use for_loops_over_fallibles::*;
 use hidden_unicode_codepoints::*;
+use if_let_rescope::IfLetRescope;
 use impl_trait_overcaptures::ImplTraitOvercaptures;
 use internal::*;
 use invalid_from_utf8::*;
@@ -243,6 +245,7 @@ late_lint_methods!(
             NonLocalDefinitions: NonLocalDefinitions::default(),
             ImplTraitOvercaptures: ImplTraitOvercaptures,
             TailExprDropOrder: TailExprDropOrder,
+            IfLetRescope: IfLetRescope,
         ]
     ]
 );