requires a use before class is visible

Author: coke

doc/Type/Telemetry/Sampler.pod6

@@ -24,6 +24,7 @@ to use when making a snapshot.
 
 =head2 method new
 
+=for code :preamble<use Telemetry>
   method new(Telemetry::Sampler: @instruments --> Telemetry::Sampler:D)
 
 The C<new> method takes a list of instruments.  If no instruments are specified,
@@ -40,6 +41,7 @@ the same as C<Telemetry::Instrument::Usage>.
 
 =head2 method set-instruments
 
+=for code :preamble<use Telemetry>
   method set-instruments(Telemetry::Sampler:D @instruments --> Nil)
 
 Allows one to change the instruments on an existing C<Instrument::Sampler>