3 files changed, 29 insertions, 1 deletions
diff --git a/lib/core/macros.nim b/lib/core/macros.nim
index 6525770eb..d27d97f2f 100644
--- a/lib/core/macros.nim
+++ b/lib/core/macros.nim
@@ -360,6 +360,13 @@ when defined(nimHasSignatureHashInMacro):
     ## the owning module of the symbol and others. The same identifier is
     ## used in the back-end to produce the mangled symbol name.
 
+proc symBodyHash*(s: NimNode): string {.noSideEffect.} =
+  ## Returns a stable digest for symbols derived not only from type signature
+  ## and owning module, but also implementation body. All procs/varibles used in
+  ## the implementation of this symbol are hashed recursively as well, including
+  ## magics from system module.
+  discard
+
 proc getTypeImpl*(n: typedesc): NimNode {.magic: "NGetType", noSideEffect.}
   ## Version of ``getTypeImpl`` which takes a ``typedesc``.
 
diff --git a/lib/pure/md5.nim b/lib/pure/md5.nim
index 794d839f8..ae8e12707 100644
--- a/lib/pure/md5.nim
+++ b/lib/pure/md5.nim
@@ -197,7 +197,9 @@ proc `$`*(d: MD5Digest): string =
     add(result, digits[d[i].int and 0xF])
 
 proc getMD5*(s: string): string =
-  ## Computes an MD5 value of `s` and returns its string representation.
+  ## Computes an MD5 value of `s` and returns its string representation. 
+  ## .. note::
+  ## available at compile time
   ##
   ## See also:
   ## * `toMD5 proc <#toMD5,string>`_ which returns the `MD5Digest` of a string
diff --git a/lib/system/io.nim b/lib/system/io.nim
index e93f602ae..4497b1b0b 100644
--- a/lib/system/io.nim
+++ b/lib/system/io.nim
@@ -612,6 +612,25 @@ proc writeFile*(filename, content: string) {.tags: [WriteIOEffect], benign.} =
   else:
     sysFatal(IOError, "cannot open: " & filename)
 
+
+proc readLines*(filename: string, n = 1.Natural): seq[TaintedString] =
+  ## read `n` lines from the file named `filename`. Raises an IO exception
+  ## in case of an error. Raises EOF if file does not contain at least `n` lines.
+  ## Available at compile time. A line of text may be delimited by ``LF`` or ``CRLF``.
+  ## The newline character(s) are not part of the returned strings.
+  var f: File
+  if open(f, filename):
+    try:
+      result = newSeq[TaintedString](n)
+      for i in 0 .. n - 1:
+        if not readLine(f, result[i]):
+          raiseEOF()
+    finally:
+      close(f)
+  else:
+    sysFatal(IOError, "cannot open: " & filename)
+
+
 iterator lines*(filename: string): TaintedString {.tags: [ReadIOEffect].} =
   ## Iterates over any line in the file named `filename`.
   ##