Correct nested interpolation

Author: lkdvos

src/tensors/linalg.jl

@@ -464,7 +464,7 @@ for f in (:sqrt, :log, :asin, :acos, :acosh, :atanh, :acoth)
     sf = string(f)
     @eval function Base.$f(t::AbstractTensorMap)
         domain(t) == codomain(t) ||
-            error("$sf of a tensor only exist when domain == codomain.")
+            error("$($sf) of a tensor only exist when domain == codomain.")
         T = complex(float(scalartype(t)))
         tf = similar(t, T)
         for (c, b) in blocks(t)