noexcept operator with lambdas. MSVC bug?

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It appears that MSVC treats all lambdas as noexcept. This code compiles in msvc 19.28 (checked in Compiler Explorer), but expectedly fails the static assertion in gcc:

void foo() {
  auto lambda_may_throw = [] {};

  static_assert(noexcept(lambda_may_throw()));
}

What is interesting is that I googled a bit but was unable to find any info on this issue. Is this really an msvc bug or just me failing to understand something?

noexcept visual-c++ c++
1 Answers

The behavior is only observed with /permissive. When compiling with /permissive-, the assert triggers.

So perhaps it is a compatibility extension to support older Visual Studio code.

(You also may observe that it fails with /std:c++latest and compiles with /std:c++17 without specifying /permissive-. This is not the difference in standards, rather /std:c++latest also implies /permissive- by default)

user_29450270
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