discard """ msg: "int\nstring\nTBar[int]" output: "int\nstring\nTBar[int]\nint\nrange 0..2(int)\nstring" disabled: true """ import typetraits # simple case of type trait usage inside/outside of static blocks proc foo(x) = static: var t = type(x) echo t.name echo x.type.name type TBar[U] = object x: U var bar: TBar[int] foo 10 foo "test" foo bar # generic params on user types work too proc foo2[T](x: TBar[T]) = echo T.name foo2 bar # less usual generic params on built-in types var arr: array[0..2, int] = [1, 2, 3] proc foo3[R, T](x: array[R, T]) = echo name(R) foo3 arr const TypeList = [int, string, seq[int]] macro selectType(inType: typedesc): typedesc = var typeSeq = @[float, TBar[int]] for t in TypeList: typeSeq.add(t) typeSeq.add(inType) typeSeq.add(type(10)) var typeSeq2: seq[typedesc] = @[] typeSeq2 = typeSeq result = typeSeq2[5] var xvar: selectType(string) xvar = "proba" echo xvar.type.name