fix renderer, add test for nim-lang#7085

compiler/renderer.nim

@@ -379,6 +379,7 @@ proc atom(g: TSrcGen; n: PNode): string =
   of nkEmpty: result = ""
   of nkIdent: result = n.ident.s
   of nkSym: result = n.sym.name.s
+  of nkClosedSymChoice, nkOpenSymChoice: result = n[0].sym.name.s
   of nkStrLit: result = ""; result.addQuoted(n.strVal)
   of nkRStrLit: result = "r\"" & replace(n.strVal, "\"", "\"\"") & '\"'
   of nkTripleStrLit: result = "\"\"\"" & n.strVal & "\"\"\""

tests/template/mdotcall.nim

@@ -1,3 +1,5 @@
+# issue #20073
+
 type Foo = object
 proc foo(f: Foo) = discard
 
@@ -9,3 +11,12 @@ template boom*() =
   var f: Foo
   f.foo() # Error: attempting to call undeclared routine: 'foo'
   f.foo # Error: undeclared field: 'foo' for type a.Foo
+
+# issue #7085
+
+proc bar(a: string): string =
+  return a & "bar"
+
+template baz*(a: string): string =
+  var b = a.bar()
+  b

tests/template/tdotcall.nim

@@ -1,6 +1,10 @@
-# issue #20073
-
 import mdotcall
 
+# issue #20073
 works()
 boom()
+
+# issue #7085
+doAssert baz("hello") == "hellobar"
+doAssert baz"hello" == "hellobar"
+doAssert "hello".baz == "hellobar"