[llvm-bugs] [Bug 39837] New: clang does not warn about nodiscard in a range-based for loop

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39837

            Bug ID: 39837
           Summary: clang does not warn about nodiscard in a range-based
                    for loop
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: blastrock at free.fr
                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

clang does not issue a warning when compiling the following program:

#include <initializer_list>

struct [[nodiscard]] X {};
X f() { return {}; }

int main(int argc, char *argv[]) {
  for (int const& i : {1})
    f(); // Should warn here!
  return 0;
}

Godbolt link: https://godbolt.org/z/7sAfXU

It does issue a warning if we put explicit braces in the for-loop body though.

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