[BUG] undefined constant Crystal::Scheduler - with Crystal v1.16.3 and -Dexecution_context

[crimson-knight]

Describe the bug
After adding the shard to my shard.yml file and installing the dependencies, when I try to compile I get this error:

In lib/nbchannel/src/nbchannel.cr:57:9

 57 | Crystal::Scheduler.reschedule
      ^-----------------
Error: undefined constant Crystal::Scheduler

Expected behavior
The shard to be added to the shard.yml file and the code should compile and run as usual with the instrumentation added in.

Versions(please complete the following information):

• OS: MacOS 14.7.6
• Crystal: 1.16.3 with -Dpreview_mt -Dexecution_context flags