Possible try/catch parser issue?

[sbromberger]

Following up from https://groups.google.com/d/msg/julia-users/Dp7L9xfJtsY/rmMEAtnsBQAJ:

julia> try
       using LightGraphs
       catch
       end


julia> Graph
ERROR: UndefVarError: Graph not defined

but

julia> try
       using LightGraphs
       true
       catch
       false
       end
true


julia> Graph
LightGraphs.Graph

and

julia> try
       using LightGraphs
       nothing
       catch
       end

julia> Graph
LightGraphs.Graph

error thrown is

julia> try
       using LightGraphs
       catch y
       println("y = $y")
       end
y = ErrorException("unsupported or misplaced expression using")

Why the inconsistency?

[ihnorton]

related: #5352 #8051

[KristofferC]

Both of the examples that failed work on 0.5. Lightgraphs fail to precompile on 0.6 but it seems the underlying problem is fixed.