Fix for Julia v1.0 and Julia v1.3

src/dispatch.jl

@@ -233,6 +233,16 @@ function Base.:-(A::LinearAlgebra.Hermitian{<:AbstractMutable})
     return LinearAlgebra.Hermitian(-parent(A), LinearAlgebra.sym_uplo(A.uplo))
 end
 
+# Needed for Julia v1.0, otherwise, `broadcast(*, α, A)` gives a `Array` and
+# not a `Symmetric`.
+function Base.:*(α::Number, A::LinearAlgebra.Symmetric{<:AbstractMutable})
+    return LinearAlgebra.Symmetric(α * parent(A), LinearAlgebra.sym_uplo(A.uplo))
+end
+function Base.:*(α::Number, A::LinearAlgebra.Hermitian{<:AbstractMutable})
+    return LinearAlgebra.Hermitian(α * parent(A), LinearAlgebra.sym_uplo(A.uplo))
+end
+
+
 # These three have specific methods that just redirect to `Matrix{T}` which
 # does not work, e.g. if `zero(T)` has a different type than `T`.
 function Base.Matrix(x::LinearAlgebra.Tridiagonal{T}) where T<:AbstractMutable

test/dummy.jl

@@ -44,6 +44,7 @@ MA.promote_operation(::typeof(*), ::Type{DummyBigInt}, ::Type{DummyBigInt}) = Du
 Base.convert(::Type{DummyBigInt}, x::Int) = DummyBigInt(x)
 MA.isequal_canonical(x::DummyBigInt, y::DummyBigInt) = x.data == y.data
 Base.iszero(x::DummyBigInt) = iszero(x.data)
+Base.isone(x::DummyBigInt) = isone(x.data)
 # We don't define == to tests that implementation of MA can pass the tests without defining ==.
 # This is the case for MOI functions for instance.
 # For th same reason, we only define `zero` and `one` for `Type{DummyBigInt}`, not for `DummyBigInt`.