Fix interpolated string span and trace names #136
Merged
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This PR fixes #135 where runtime interpolated strings cannot be passed as arguments to the
Tracer.span
andTracer.trace
macros.I have moved the guard clauses to
Spandex.start_trace/2
andSpandex.start_span/2
and added guard clauses to the disabled failure case. This ensures the FunctionClauseError is raised if the macro invocation is ever reached in tests. Though, of course, this isn't as effective at preventing bad arguments as a compile time warning.