Fix insert to 0-length SVector (#1004)

Author: mateuszbaran

Project.toml

@@ -1,6 +1,6 @@
 name = "StaticArrays"
 uuid = "90137ffa-7385-5640-81b9-e52037218182"
-version = "1.4.0"
+version = "1.4.1"
 
 [deps]
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"

src/deque.jl

@@ -69,7 +69,7 @@ julia> insert(@SVector[6, 5, 4, 2, 1], 4, 3)
 @propagate_inbounds insert(vec::StaticVector, index, x) = _insert(Size(vec), vec, index, x)
 @generated function _insert(::Size{s}, vec::StaticVector, index, x) where {s}
     newlen = s[1] + 1
-    exprs = [(i == 1 ? :(ifelse($i < index, vec[$i], x)) :
+    exprs = [(i == 1 ? :(if $i < index; vec[$i] else x; end) :
               i == newlen ? :(ifelse($i == index, x, vec[$i-1])) :
               :(ifelse($i < index, vec[$i], ifelse($i == index, x, vec[$i-1])))) for i = 1:newlen]
     return quote

test/deque.jl

@@ -14,6 +14,9 @@ using StaticArrays, Test
 
     @test @inferred(setindex(v, -2, 2)) === @SVector [1, -2, 3]
 
+    # issue https://github.com/JuliaArrays/StaticArrays.jl/issues/1003
+    @test @inferred(insert(SVector{0,Int}(), 1, 10)) === @SVector [10]
+
     @test_throws BoundsError insert(v, -2, 2)
     @test_throws BoundsError deleteat(v, -2)
     @test_throws BoundsError setindex(v, 2, -2)