ioutils are moved to fusion (#15822)

tests/stdlib/tioutils.nim

@@ -1,49 +0,0 @@
-discard """
-  output: '''
-hello1
-hello1
-'''
-"""
-
-import std/ioutils
-import os
-from stdtest/specialpaths import buildDir
-
-block: # duplicate, duplicateTo
-  let tmpFileName = buildDir / "tioutils.txt"
-  template captureStdout(body) : untyped =
-    let stdoutFileno = stdout.getFileHandle()
-    # Duplicate stoudFileno
-    let stdout_dupfd = duplicate(stdoutFileno)
-    # Create a new file
-    # You can use append strategy if you'd like
-    let tmpFile: File = open(tmpFileName, fmWrite)
-    # Get the FileHandle (the file descriptor) of your file
-    let tmpFileFd: FileHandle = tmpFile.getFileHandle()
-    # dup2 tmpFileFd to stdoutFileno -> writing to stdoutFileno now writes to tmpFile
-    duplicateTo(tmpFileFd, stdoutFileno)
-    body
-    # Force flush
-    tmpFile.flushFile()
-    # Close tmp
-    tmpFile.close()
-    # Read tmp
-    let ret = readFile(tmpFileName)
-    # Restore stdout
-    duplicateTo(stdout_dupfd, stdoutFileno)
-    ret
-
-  proc duplicateStdout() =
-    var msg = "hello"
-    echo msg & "1"
-
-    let s = captureStdout:
-      echo msg & "2"
-
-    doAssert s == "hello2\n"
-
-  discard tryRemoveFile(tmpFileName)
-  duplicateStdout()
-  # Check it works twice
-  duplicateStdout()
-  doAssert tryRemoveFile(tmpFileName)