Earlier error message

JuliaSymbolics · Feb 27, 2024 · 81d67e4 · 81d67e4
1 parent 8842aa6
commit 81d67e4
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/diff.jl b/src/diff.jl
@@ -32,7 +32,7 @@ julia> D3 = Differential(x)^3 # 3rd order differential operator
 struct Differential <: Operator
     """The variable or expression to differentiate with respect to."""
     x::BasicSymbolic
-    function Differential(x)
+    function Differential(x::BasicSymbolic)
         vx = value(x)
         SymbolicUtils.exprtype(vx) == SymbolicUtils.SYM || throw(ArgumentError("Must differentiate with respect to a symbol, got $vx"))
         new(vx)