[PATCH] D53595: [C++17] Reject shadowing of capture by parameter in lambda

[Nicolas Lesser via Phabricator via cfe-commits]

Rakete1111 created this revision.
Rakete1111 added a reviewer: rsmith.

This change rejects the shadowing of a capture by a parameter in lambdas in C++17.

  int main() {
    int a;
    auto f = [a](int a) { return a; };
  }

results in:

  main.cpp:3:20: error: a lambda parameter cannot shadow an explicitly captured entity
    auto f = [a](int a) { return a; };
                     ^
  main.cpp:3:13: note: variable a is explicitly captured here
    auto f = [a](int a) { return a; };
              ^


Repository:
  rC Clang

https://reviews.llvm.org/D53595

Files:
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Sema/Sema.h
  lib/Sema/SemaLambda.cpp
  test/SemaCXX/warn-shadow-in-lambdas.cpp

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