add test

Author: timotheecour

tests/metatype/ttypetraits2.nim

@@ -14,3 +14,26 @@ block: # isNamedTuple
   doAssert not Foo3.isNamedTuple
   doAssert not Foo4.isNamedTuple
   doAssert not (1,).type.isNamedTuple
+
+proc typeToString*(t: typedesc, prefer = "preferTypeName"): string {.magic: "TypeTrait".}
+  ## Returns the name of the given type, with more flexibility than `name`,
+  ## and avoiding the potential clash with a variable named `name`.
+  ## prefer = "preferResolved" will resolve type aliases recursively.
+  # Move to typetraits.nim once api stabilized.
+
+block: # typeToString
+  type MyInt = int
+  type
+    C[T0, T1] = object
+  type C2=C # alias => will resolve as C
+  type C2b=C # alias => will resolve as C (recursively)
+  type C3[U,V] = C[V,U]
+  type C4[X] = C[X,X]
+  template name2(T): string = typeToString(T, "preferResolved")
+  doAssert MyInt.name2 == "int"
+  doAssert C3[MyInt, C2b].name2 == "C3[int, C]"
+    # C3 doesn't get resolved to C, not an alias (nor does C4)
+  doAssert C2b[MyInt, C4[cstring]].name2 == "C[int, C4[cstring]]"
+  doAssert C4[MyInt].name2 == "C4[int]"
+  when BiggestFloat is float and cint is int:
+    doAssert C2b[cint, BiggestFloat].name2 == "C3[int, C3[float, int32]]"