@aside cuts the chain if the last statement

[pfarndt]

If @aside is the last last statement in a chain then it is cut. Consider:

using DataFrames, DataFramesMeta (v0.8.0)

df = @chain DataFrame(a = 1:4) begin
    @aside println(nrow(_))
end

This just prints out 4 and assigns nothing to df. This is unexpected and unfortunate because one sometimes wants to know how many rows are left (or something similar) after some data crunching steps.

A possible (but unattractive) workaround is to place an identity in the last line:

df = @chain DataFrame(a = 1:4) begin
    @aside println(nrow(_))
    identity
end

This now assigns df to be the expected 4 row DataFrame.

[jkrumbiegel]

Ah yeah I knew about this but didn't have time to fix it. I just need to repeat the last temp variable if the last statement is an @aside one

[jkrumbiegel]

fixed here e89262b