Reorder methods.
Note: produces ambiguity warning at compile time
Warning: New definition
A_mul_Bc could not show value of type Tuple at
linalg/factorization.jl:370
is ambiguous with:
A_mul_Bc could not show value of type Tuple at
linalg/triangular.jl:180.
To fix, define
A_mul_Bc could not show value of type Tuple
before the new definition.