Argument destructuring doesn't work with callable structs #36572
Closed
Description
Consider the following iterable struct. We see that argument destructuring works as expected when Foo is the argument to a function:
struct Foo{T}
a::T
b::T
end
function Base.iterate(f::Foo, i=1)
if i == 1
(f.a, 2)
elseif i == 2
(f.b, 3)
else
nothing
end
end
apply((a,b)::Foo, x) = (a*x + b)/(b'x + a')
apply(Foo(1,2), 1+im)
#+RESULTS:
: 0.8461538461538461 - 0.23076923076923078imbut it fails if we try to make the struct itself callable and use destructing on the struct:
((a,b)::Foo)(x) = (a*x + b)/(b'x + a')
#+RESULTS:
:RESULTS:
# [goto error]
: syntax: "(a, b)" is not a valid function argument name around In[20]:1
:
: Stacktrace:
: [1] top-level scope at none:1
:END:I think it'd be nice for consistency to allow this syntax.