[llvm-bugs] [Bug 49053] New: Variable declared in if init statement sneaks into lambda expression

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49053

            Bug ID: 49053
           Summary: Variable declared in if init statement sneaks into
                    lambda expression
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sgiesecke at mozilla.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

The following code fails to compile with clang:
```
int main() {
    if (auto foo = [] { int foo = 42; return true; }()) {}
}
```
saying
    #1 with x86-64 clang (trunk)

<source>:2:29: error: redefinition of 'foo' with a different type: 'int' vs
'auto'
    if (auto foo = [] { int foo = 42; return true; }()) {}
                            ^
<source>:2:14: note: previous definition is here
    if (auto foo = [] { int foo = 42; return true; }()) {}
             ^
1 error generated.
ASM generation compiler returned: 1
<source>:2:29: error: redefinition of 'foo' with a different type: 'int' vs
'auto'
    if (auto foo = [] { int foo = 42; return true; }()) {}
                            ^
<source>:2:14: note: previous definition is here
    if (auto foo = [] { int foo = 42; return true; }()) {}
             ^
1 error generated.
Execution build compiler returned: 1

```

gcc accepts this code, and this seems right. The lambda expression does not
capture foo.

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