looking_glass

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Error if try trace non existing application

3

**Error:** ```erlang 1> lg:trace({app, 'bla-bla'}). ** exception error: no match of right hand side value undefined in function lg:flatten/2 (/some-app/_build/default/lib/looking_glass/src/lg.erl, line 91) in call from lg:do_trace/4 (/some-app/_build/default/lib/looking_glass/src/lg.erl, line 78) 2>...

vkatsuba

``` OTP-14734 Application(s): erts Related Id(s): ERL-496 BIFs now behave like ordinary functions with regard to tracing, allowing call_count tracing and fixing a few bugs where return trace messages were...

essen

Also fix the OTP docs to indicate which flag enables the `gc_major_*` messages.

essen