Well I'll be damned, tried it on Bionic (Ubuntu 18) and it seems to work just fine:
``` curl -L https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add - sudo apt-add-repository "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-6.0 main" sudo apt-get update sudo apt-get install -y clang-6.0 ``` ```test.cpp #include <optional> int main() { std::optional<int> o1; } ``` ``` $ clang++-6.0 -std=c++17 -o test test.cpp ``` Sorry for the noise, Milan
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