Merge pull request #9 from JuliaSymbolics/s/similarterm-signature

fix method chosen when exprhead is not used

Project.toml

@@ -1,7 +1,7 @@
 name = "TermInterface"
 uuid = "8ea1fca8-c5ef-4a55-8b96-4e9afe9c9a3c"
 authors = ["Shashi Gowda <[email protected]>", "Alessandro Cheli <[email protected]>"]
-version = "0.2.0"
+version = "0.2.1"
 
 [compat]
 julia = "1"

src/TermInterface.jl

@@ -110,16 +110,21 @@ end
 
 
 """
-    similarterm(x, head, args, symtype=nothing; metadata=nothing, exprhead=exprhead(x))
+    similarterm(x, head, args, symtype=nothing; metadata=nothing, exprhead=:call)
 
 Returns a term that is in the same closure of types as `typeof(x)`,
 with `head` as the head and `args` as the arguments, `type` as the symtype
 and `metadata` as the metadata. By default this will execute `head(args...)`.
 `x` parameter can also be a `Type`. The `exprhead` keyword argument is useful 
 when manipulating `Expr`s.
 """
-similarterm(x, head, args, symtype=nothing; metadata=nothing, exprhead=exprhead(x)) = 
-    similarterm(typeof(x), head, args, symtype; metadata=metadata, exprhead=exprhead)
+function similarterm(x, head, args, symtype=nothing; metadata=nothing, exprhead=nothing)
+    if exprhead === nothing
+        similarterm(typeof(x), head, args, symtype; metadata=metadata)
+    else
+        similarterm(typeof(x), head, args, symtype; metadata=metadata, exprhead=exprhead)
+    end
+end
 
 function similarterm(x::Type{T}, head, args, symtype=nothing; metadata=nothing, exprhead=:call) where T
     !istree(T) ? head : head(args...)