On Sunday, 16 September 2018 at 09:46:15 UTC, berni wrote:
Where is my mistake?
Lambdas are not the issue here. The problem is more general: you can only use top-level symbols in UFCS.
You can use an identity alias template to bypass this: https://blog.thecybershadow.net/2015/04/28/the-amazing-template-that-does-nothing/ (search for UFCS in the page).
