fixup! remove unecessary consts

Author: vchuravy

test/DiffTests.jl

@@ -293,7 +293,7 @@ end
     # `Ref{Any}` container only to be able to catch and test the warnings emitted during
     # compilation in the body of the function.
     test_mat2num = Ref{Any}(test_matrix_to_number)
-    warn_msg = f === DiffTests.vec2num_3 ? r"Using fallback BLAS replacements for" : ""
+    warn_msg = f === vec2num_3 ? r"Using fallback BLAS replacements for" : ""
     @test_warn warn_msg test_mat2num[](f, y; rtol = 1.0e-6, atol = 1.0e-6)
 end