gistfile1.txt

test.nim(2, 9) Error: undeclared identifier: 'T'
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template foo[T](a: T, body: stmt): stmt {.immediate.} =
  var b: T
  body

foo("a"):
  discard "" # Anything else too


Compiles
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template foo(T: typedesc, a: T, body: stmt): stmt {.immediate.} =
  var b: T
  body

foo(string, "a"):
  discard "" # Anything else too