fixup! feat: support array variables in linear_expansion

test/linear_solver.jl

@@ -62,15 +62,15 @@ a, b, islinear = Symbolics.linear_expansion(D(x) - x, x)
 
 @testset "linear_expansion with array variables" begin
     @variables x[1:2] y[1:2] z(..)
-    @test !linear_expansion(z(x) + x[1], x[1])[3]
-    @test !linear_expansion(z(x[1]) + x[1], x[1])[3]
-    a, b, islin = linear_expansion(z(x[2]) + x[1], x[1])
+    @test !Symbolics.linear_expansion(z(x) + x[1], x[1])[3]
+    @test !Symbolics.linear_expansion(z(x[1]) + x[1], x[1])[3]
+    a, b, islin = Symbolics.linear_expansion(z(x[2]) + x[1], x[1])
     @test islin && isequal(a, 1) && isequal(b, z(x[2]))
-    a, b, islin = linear_expansion((x + x)[1], x[1])
+    a, b, islin = Symbolics.linear_expansion((x + x)[1], x[1])
     @test islin && isequal(a, 2) && isequal(b, 0)
-    a, b, islin = linear_expansion(y[1], x[1])
+    a, b, islin = Symbolics.linear_expansion(y[1], x[1])
     @test islin && isequal(a, 0) && isequal(b, y[1])
-    @test !linear_expansion(z([x...]), x[1])[3]
-    @test !linear_expansion(z(collect(unwrap(x))), x[1])[3]
-    @test !linear_expansion(z([x, 2x]), x[1])[3]
+    @test !Symbolics.linear_expansion(z([x...]), x[1])[3]
+    @test !Symbolics.linear_expansion(z(collect(unwrap(x))), x[1])[3]
+    @test !Symbolics.linear_expansion(z([x, 2x]), x[1])[3]
 end