[llvm-bugs] [Bug 46242] New: Compiler error when using lambda inside if initializer

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https://bugs.llvm.org/show_bug.cgi?id=46242

            Bug ID: 46242
           Summary: Compiler error when using lambda inside if initializer
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: danijel.zlaus at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Hi, I have discovered a slight bug (?). The following code does not compile
when the lambda is used inside an if initializer

//Compiler error, error: redefinition of 'foo'
if(int foo = [&](){
            int foo = 0;
            return foo;
        }();
        foo)
{
    ...
}

While if the same code is used outside of an initilizer statement it works as
expected. 

int foo = [&](){
            int foo = 0;
            return foo;
        }();
if(foo)
{
    return 1;
}


GCC compiles both cases fine, so I suspect this is a bug in the clang frontend.

Example on compiler explorer here:
https://godbolt.org/z/hcUZrx

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