Fix incorrectly typed method for _vec_mul_arguments (#350)

* Constrain

* test

Author: DanielVandH

Project.toml

@@ -1,6 +1,6 @@
 name = "LazyArrays"
 uuid = "5078a376-72f3-5289-bfd5-ec5146d43c02"
-version = "2.2.2"
+version = "2.2.3"
 
 [deps]
 ArrayLayouts = "4c555306-a7a7-4459-81d9-ec55ddd5c99a"

src/linalg/mul.jl

@@ -236,7 +236,7 @@ _vec_mul_view(a...) = view(a...)
 _vec_mul_view(a::AbstractVector, kr, ::Colon) = view(a, kr)
 
 # this is a vector view of a MulVector
-function _vec_mul_arguments(args, (kr,))
+function _vec_mul_arguments(args, (kr,)::Tuple{Any})
     kjr = intersect.(_mul_args_rows(kr, args...), _mul_args_cols(Base.OneTo(1), reverse(args)...))
     _vec_mul_view.(args, (kr, kjr...), (kjr..., :))
 end

test/runtests.jl

@@ -460,6 +460,9 @@ end
     @test bc.args[2] == 3
 end
 
+@testset "_vec_mul_arguments method" begin
+    @test_throws "MethodError: no method matching _vec_mul_arguments"  LazyArrays._vec_mul_arguments(2, [])
+end
 
 include("blocktests.jl")
 include("bandedtests.jl")