/examples/lanes/error.lua

--

-- Error reporting

--

-- Note: this code is supposed to end in errors; not included in 'make test'

--



require "lanes"



local function lane()



    local subf= function()  -- this so that we can see the call stack

        --error "aa"

        error({})

        error(error)

    end

    local subf2= function()

        subf()

    end

    subf2()

end



local function cleanup(err)

end



local lgen = lanes.gen("*", { --[[finalizer=cleanup]] }, lane)



---

io.stderr:write( "\n** Error catching **\n" )

--

local h= lgen()

local _,err,stack= h:join()   -- wait for the lane (no automatic error propagation)



if err then

    assert( type(stack)=="table" )

    io.stderr:write( "Lane error: "..tostring(err).."\n" )



    io.stderr:write( "\t", table.concat(stack,"\n\t"), "\n" );

end



---

io.stderr:write( "\n** Error propagation **\n" )

--

local h2= lgen()

local _= h2[0]

assert(false)   -- does NOT get here



--never ends