skip'

Author: mcabbott

src/projection.jl

@@ -488,10 +488,10 @@ end
 # Subspaces which aren't subtypes, like Diagonal inside Symmetric above:
 (project::ProjectTo{UpperTriangular})(dx::Diagonal) = project.data(dx)
 (project::ProjectTo{LowerTriangular})(dx::Diagonal) = project.data(dx)
-
-(project::ProjectTo{UpperHessenberg})(dx::Diagonal) = project.data(dx)
-(project::ProjectTo{UpperHessenberg})(dx::UpperTriangular) = project.data(dx)
-
+if VERSION >= v"1.4"
+    (project::ProjectTo{UpperHessenberg})(dx::Diagonal) = project.data(dx)
+    (project::ProjectTo{UpperHessenberg})(dx::UpperTriangular) = project.data(dx)
+end
 (project::ProjectTo{UnitUpperTriangular})(dx::Diagonal) = NoTangent()
 (project::ProjectTo{UnitLowerTriangular})(dx::Diagonal) = NoTangent()
 

src/tangent_types/abstract_zero.jl

@@ -80,7 +80,7 @@ function _promote_vectors(x::AbstractVector, y::AbstractVector)
     if isconcretetype(T)
         return convert(T, x), convert(T, y)
     else
-        short = map(first∘promote, x, y)
+        short = map(first ∘ promote, x, y)
         return convert(typeof(short), x), convert(typeof(short), y)
     end
 end