Environment

toml++ version and/or commit hash: 2.5.0

Compiler: gcc 7.3.1 (but I believe all versions including the latest as of writing, 11.2)

C++ standard mode: 17

Target arch: x64

Library configuration overrides: TOML_EXCEPTIONS is 1

Relevant compilation flags: None

Describe the bug

There's a gcc bug that causes a memory leak when an exception is thrown by parse_value() here, specifically because the destructor of the moved-to key is not called.

It looks like you've done a significant refactor for toml++ v3, so feel free to withdraw this if it's no longer an issue going forward.

Additional information

We found this using AddressSanitizer. Does it make sense to incorporate this tool into your tests and CI?

Nice library! Looking forward to v3. 😃👍