This is my code for now:
$ cat src/sentry.cr
require "sentry"
This is the error I get:
$ crystal run src/sentry.cr
Showing last frame. Use --error-trace for full trace.
In lib/sentry/src/sentry.cr:12:10
12 | YAML.mapping(
^------
Error: undefined method 'mapping' for YAML:Module
This is Crystal:
$ crystal --version
Crystal 1.0.0 [dd40a2442] (2021-03-22)
LLVM: 10.0.0
Default target: x86_64-unknown-linux-gnu
Running on Ubuntu 21.04