Merge pull request #20971 from Sacha0/nixrowvecambigs

resolve ambiguity between * methods

Author: Sacha0

base/linalg/rowvector.jl

@@ -165,6 +165,7 @@ end
 
 # inner product -> dot product specializations
 @inline *{T<:Real}(rowvec::RowVector{T}, vec::AbstractVector{T}) = dot(parent(rowvec), vec)
+@inline *{T<:Real}(rowvec::ConjRowVector{T}, vec::AbstractVector{T}) = dot(rowvec', vec)
 @inline *(rowvec::ConjRowVector, vec::AbstractVector) = dot(rowvec', vec)
 
 # Generic behavior

test/linalg/rowvector.jl

@@ -249,3 +249,7 @@ end
         @test A'*x' == A'*y == B*x' == B*y == C'
     end
 end
+
+@testset "ambiguity between * methods with RowVectors and ConjRowVectors (#20971)" begin
+    @test RowVector(ConjArray(ones(4))) * ones(4) == 4
+end