Merge remote-tracking branch 'nim-lang/devel' into emscripten-support

tests/stdlib/tmemfiles1.nim

@@ -1,5 +1,4 @@
 discard """
-  test that closing a closed file is ignored (no error raised)
   file: "tmemfiles1.nim"
 """
 import memfiles, os

tests/stdlib/tmemfiles2.nim

@@ -1,5 +1,4 @@
 discard """
-  test creating/reading/writing/changing memfiles
   file: "tmemfiles2.nim"
   output: '''Full read size: 20
 Half read size: 10 Data: Hello'''

tests/stdlib/tstreams2.nim

@@ -0,0 +1,13 @@
+discard """
+  file: "tstreams2.nim"
+  output: '''fs is: nil'''
+"""
+import streams
+var
+  fs = newFileStream("amissingfile.txt")
+  line = ""
+echo "fs is: ",repr(fs)
+if not isNil(fs):
+  while fs.readLine(line):
+    echo line
+  fs.close()