What is that macro supposed to do?
On Monday, March 16, 2015 at 7:12:14 AM UTC+2, Miao Yang wrote: > > macro awhen(expr, body...) > esc(quote > let it = $(expr) > if it != nothing > $(body...) > end > end > end) > end > > julia> @awhen([1, 2, 3], it[2]) # workds fine > 2 > julia> @awhen(nothing, it[2]) # workds fine > > julia> @awhen([1, 2, 3], x = 1, it[x]) # :(, failed > > ERROR: unsupported or misplaced expression kw > > > julia> macroexpand(:@awhen([1,2,3], x = 1, it[x])) > quote # none, line 3: > let it = [1,2,3] # line 4: > if it != nothing # line 5: > x=1 > it[x] > end > end > end > > > Have no idea how to let this worked... > Please help me, thanks. >
