clang does not warn about uninitialized reads in lambdas

[nico]

This warns (as it should):

$ cat test.cc
struct S {};

void g() {
  S s1 = s1;
}

$ out/gn/bin/clang -c test.cc
test.cc:4:10: warning: variable 's1' is uninitialized when used within its own initialization [-Wuninitialized]
    4 |   S s1 = s1;
      |     ~~   ^~
1 warning generated.

This doesn't (but should, too):

$ cat test.cc
struct S {};

void g() {
  S s2 = [&]() { return s2; }();
}

$ out/gn/bin/clang -c test.cc
# No diag

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Nico Weber (nico)

This warns (as it should):

$ cat test.cc
struct S {};

void g() {
  S s1 = s1;
}

This doesn't (but should, too):

$ cat test.cc
struct S {};

void g() {
  S s2 = [&]() { return s2; }();
}

$ out/gn/bin/clang -c test.cc
# No diag

[zhaohuiw42]

I'm interested in working on this. Can it be assigned to me?

[zyn0217]

@zhaohuiw42 Here it is. Though I'm not sure if this is a good-first-issue ...