incorrect determination of macro # of arguments

[StephenVavasis]

The macro invocation below fails with an error "wrong number of arguments". Notice that the expression is spread over two lines. Somehow the loader is seeing the text after @einsum as two (or more?) arguments to the einsum macro instead of just one. This is version 0.4.5 (downloaded today)

The problem goes away if I concatenate the two lines into one. Even more oddly, the problem goes away if I simply insert a space character after the plus sign that terminates the first line!

This problem is not special for the einsum macro; the same thing happens for other macros I tried.

        @einsum ws.d_deltas[ind1,ind2,ind3,ind4] = ws.d_deltas_t1[ind1,ind2,ind3,ind4] +
         ws.d_deltas_t2[ind1,ind2,ind3,ind4] # (s,I,j,k)

[ivarne]

Does this work in other versions (eg. do you know/think that it previously worked)?

[kmsquire]

Even if it worked previously, making it work by adding a space at the end of a line seems pretty fragile.

[StephenVavasis]

With regard to the versions: I noticed the problem in 0.4.2, and then I downloaded 0.4.5 yesterday to see if it has been fixed. (It hasn't been.)

[vtjnash]

simpler testcase:

julia> macro einsum(args...)
         println(args)
         return length(args)
       end

julia> @einsum a = b +
(:(a = b),:+)
2

[TotalVerb]

Similar situation:

julia> [1 +
       2 0]
2×2 Array{Any,2}:
 1   +
 2  0 

julia> [1 + 
       2 0]
1×2 Array{Int64,2}:
 3  0

The only difference is that there is a trailing whitespace in the second example.

[stevengj]

As mentioned in #20258, this seems to occur only for operators like + that are both binary and unary.