diff --git a/src/enso.nim b/src/enso.nim
index 37b6d12..0a50712 100644
--- a/src/enso.nim
+++ b/src/enso.nim
@@ -3,9 +3,8 @@ import std/[options, os, sugar]
 # Declarations
 
 type
-  Error*    = enum OK, ERR
-  FileDesc* = enum STDIN, STDOUT, STDERR
-  IO*[T]    = proc(): T
+  Error* = enum OK, ERR
+  IO*[T] = proc(): T
 
 func fileread*(file: string): IO[Option[string]]
 func filewrite*(data: string, file: string): IO[Error]
@@ -14,7 +13,7 @@ func lift*(fn: proc(): void): IO[void]
 func lift*[T](fn: proc(): T): IO[T]
 func join*[T](io: IO[IO[T]]): IO[T]
 func map*[T, U](io: IO[T], fn: T -> U): IO[U]
-func readstr*(stream: FileDesc): IO[string]
+func readln*(fd: File): IO[string]
 func run*[T](io: IO[T]): T
 func strput*(str: string): IO[void]
 func to_IO*[T](val: T): IO[T]
@@ -60,14 +59,8 @@ func join*[T](io: IO[IO[T]]): IO[T] = map(io, run)
 func map*[T, U](io: IO[T], fn: T -> U): IO[U] =
   proc(): U = fn(run(io))
 
-func readstr*(stream: FileDesc): IO[string] =
-  case stream:
-    of STDIN:
-      lift proc(): string = readLine(stdin)
-    of STDOUT:
-      lift proc(): string = readLine(stdout)
-    of STDERR:
-      lift proc(): string = readLine(stderr)
+func readln*(fd: File): IO[string] =
+  proc(): string = readLine(fd)
 
 func run*[T](io: IO[T]): T = io()
 
diff --git a/test.txt b/test.txt
new file mode 100644
index 0000000..cd08755
--- /dev/null
+++ b/test.txt
@@ -0,0 +1 @@
+Hello world!
diff --git a/tests/test.nim b/tests/test.nim
index 32dc026..d15f9cb 100644
--- a/tests/test.nim
+++ b/tests/test.nim
@@ -20,7 +20,7 @@ func main() =
 
   let get_filename: IO[string] =
     proc(): string =
-      let name: IO[string] = readstr(STDIN)
+      let name: IO[string] = readln(stdin)
       echo "Enter the file name:"
       name()