[llvm-bugs] [Bug 49665] New: `-Wfor-loop-analysis` false positive when variable is modified in lambda in function template

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49665

            Bug ID: 49665
           Summary: `-Wfor-loop-analysis` false positive when variable is
                    modified in lambda in function template
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: david at doublewise.net
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

The following code

```
template<typename>
void f() {
        for (int x = 0; x != 1; ) {
                [&]{ ++x; }();
        }
}
```

when compiled with `-Wfor-loop-analysis` incorrectly warns

```
<source>:3:18: warning: variable 'x' used in loop condition not modified in
loop body [-Wfor-loop-analysis]
        for (int x = 0; x != 1; ) {
                        ^
1 warning generated.
Compiler returned: 0
```

See it live: https://godbolt.org/z/s6KPdY

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