Re: [boost] [build] ERROR: rule "[[bbv2.builtin.features.warnings]]`warnings`::" unknown in module "warnings-feature"

Mateusz Loskot wrote:

but this refers to something that puzzles me most

``` ERROR: rule "[[bbv2.builtin.features.warnings]]`warnings`::" unknown ```

a bit of comment block?

``` #| tag::doc[]

[[bbv2.builtin.features.warnings]]`warnings`:: ```

This is probably caused by using an old version of b2 that doesn't understand block comments, which were introduced relatively recently.