diff --git a/compiler/pragmas.nim b/compiler/pragmas.nim
index d9ed50cfe..602c70f4d 100644
--- a/compiler/pragmas.nim
+++ b/compiler/pragmas.nim
@@ -23,7 +23,7 @@ const
     wMagic, wNosideeffect, wSideeffect, wNoreturn, wDynlib, wHeader, 
     wCompilerproc, wProcVar, wDeprecated, wVarargs, wCompileTime, wMerge, 
     wBorrow, wExtern, wImportCompilerProc, wThread, wImportCpp, wImportObjC,
-    wNoStackFrame, wError, wDiscardable, wNoInit, wDestructor, wCodegenDecl,
+    wAsmNoStackFrame, wError, wDiscardable, wNoInit, wDestructor, wCodegenDecl,
     wGensym, wInject, wRaises, wTags, wOperator, wDelegator}
   converterPragmas* = procPragmas
   methodPragmas* = procPragmas
@@ -47,7 +47,7 @@ const
     wInjectStmt}
   lambdaPragmas* = {FirstCallConv..LastCallConv, wImportc, wExportc, wNodecl, 
     wNosideeffect, wSideeffect, wNoreturn, wDynlib, wHeader, 
-    wDeprecated, wExtern, wThread, wImportCpp, wImportObjC, wNoStackFrame,
+    wDeprecated, wExtern, wThread, wImportCpp, wImportObjC, wAsmNoStackFrame,
     wRaises, wTags}
   typePragmas* = {wImportc, wExportc, wDeprecated, wMagic, wAcyclic, wNodecl, 
     wPure, wHeader, wCompilerproc, wFinal, wSize, wExtern, wShallow, 
@@ -548,9 +548,11 @@ proc singlePragma(c: PContext, sym: PSym, n: PNode, i: int,
         of wNodecl: 
           noVal(it)
           incl(sym.loc.flags, lfNoDecl)
-        of wPure, wNoStackFrame:
+        of wPure, wAsmNoStackFrame:
           noVal(it)
-          if sym != nil: incl(sym.flags, sfPure)
+          if sym != nil:
+            if k == wPure and sym.kind in routineKinds: invalidPragma(it)
+            else: incl(sym.flags, sfPure)
         of wVolatile: 
           noVal(it)
           incl(sym.flags, sfVolatile)
diff --git a/compiler/wordrecg.nim b/compiler/wordrecg.nim
index 837bb4f50..1c8e4516c 100644
--- a/compiler/wordrecg.nim
+++ b/compiler/wordrecg.nim
@@ -62,7 +62,7 @@ type
     wWatchPoint, wSubsChar, 
     wAcyclic, wShallow, wUnroll, wLinearScanEnd, wComputedGoto, wInjectStmt,
     wWrite, wGensym, wInject, wDirty, wInheritable, wThreadVar, wEmit, 
-    wNoStackFrame,
+    wAsmNoStackFrame,
     wImplicitStatic, wGlobal, wCodegenDecl,
 
     wAuto, wBool, wCatch, wChar, wClass,
@@ -145,7 +145,7 @@ const
     "subschar", "acyclic", "shallow", "unroll", "linearscanend",
     "computedgoto", "injectstmt",
     "write", "gensym", "inject", "dirty", "inheritable", "threadvar", "emit",
-    "nostackframe", "implicitstatic", "global", "codegendecl",
+    "asmnostackframe", "implicitstatic", "global", "codegendecl",
     
     "auto", "bool", "catch", "char", "class",
     "const_cast", "default", "delete", "double",
diff --git a/doc/manual.txt b/doc/manual.txt
index 53817c508..f3602dc58 100644
--- a/doc/manual.txt
+++ b/doc/manual.txt
@@ -4893,16 +4893,16 @@ field which is used for runtime type identification is omitted. This is
 necessary for binary compatibility with other compiled languages.
 
 
-NoStackFrame pragma
--------------------
-A proc can be marked with the `noStackFrame`:idx: pragma to tell the compiler
+AsmNoStackFrame pragma
+----------------------
+A proc can be marked with the `AsmNoStackFrame`:idx: pragma to tell the compiler
 it should not generate a stack frame for the proc. There are also no exit
 statements like ``return result;`` generated and the generated C function is
 declared as ``__declspec(naked)`` or ``__attribute__((naked))`` (depending on
 the used C compiler).
 
-**Note**: This pragma should only be used by procs which consist solely of assembler
-statements.
+**Note**: This pragma should only be used by procs which consist solely of
+assembler statements.
 
 error pragma
 ------------
diff --git a/lib/system.nim b/lib/system.nim
index 2acb989c5..27be9f815 100644
--- a/lib/system.nim
+++ b/lib/system.nim
@@ -1514,7 +1514,7 @@ when not defined(NimrodVM):
     proc seqToPtr[T](x: seq[T]): pointer {.inline, nosideeffect.} =
       result = cast[pointer](x)
   else:
-    proc seqToPtr[T](x: seq[T]): pointer {.noStackFrame, nosideeffect.} =
+    proc seqToPtr[T](x: seq[T]): pointer {.asmNoStackFrame, nosideeffect.} =
       asm """return `x`"""
   
   proc `==` *[T](x, y: seq[T]): bool {.noSideEffect.} =
@@ -1797,7 +1797,7 @@ type
     len*: int           ## length of the inspectable slots
 
 when defined(JS):
-  proc add*(x: var string, y: cstring) {.noStackFrame.} =
+  proc add*(x: var string, y: cstring) {.asmNoStackFrame.} =
     asm """
       var len = `x`[0].length-1;
       for (var i = 0; i < `y`.length; ++i) {
diff --git a/lib/system/arithm.nim b/lib/system/arithm.nim
index d764a6672..d9b3aebac 100644
--- a/lib/system/arithm.nim
+++ b/lib/system/arithm.nim
@@ -111,7 +111,7 @@ const
 when asmVersion and not defined(gcc) and not defined(llvm_gcc):
   # assembler optimized versions for compilers that
   # have an intel syntax assembler:
-  proc addInt(a, b: int): int {.compilerProc, noStackFrame.} =
+  proc addInt(a, b: int): int {.compilerProc, asmNoStackFrame.} =
     # a in eax, and b in edx
     asm """
         mov eax, `a`
@@ -121,7 +121,7 @@ when asmVersion and not defined(gcc) and not defined(llvm_gcc):
       theEnd:
     """
 
-  proc subInt(a, b: int): int {.compilerProc, noStackFrame.} =
+  proc subInt(a, b: int): int {.compilerProc, asmNoStackFrame.} =
     asm """
         mov eax, `a`
         sub eax, `b`
@@ -130,7 +130,7 @@ when asmVersion and not defined(gcc) and not defined(llvm_gcc):
       theEnd:
     """
 
-  proc negInt(a: int): int {.compilerProc, noStackFrame.} =
+  proc negInt(a: int): int {.compilerProc, asmNoStackFrame.} =
     asm """
         mov eax, `a`
         neg eax
@@ -139,7 +139,7 @@ when asmVersion and not defined(gcc) and not defined(llvm_gcc):
       theEnd:
     """
 
-  proc divInt(a, b: int): int {.compilerProc, noStackFrame.} =
+  proc divInt(a, b: int): int {.compilerProc, asmNoStackFrame.} =
     asm """
         mov eax, `a`
         mov ecx, `b`
@@ -150,7 +150,7 @@ when asmVersion and not defined(gcc) and not defined(llvm_gcc):
       theEnd:
     """
 
-  proc modInt(a, b: int): int {.compilerProc, noStackFrame.} =
+  proc modInt(a, b: int): int {.compilerProc, asmNoStackFrame.} =
     asm """
         mov eax, `a`
         mov ecx, `b`
@@ -162,7 +162,7 @@ when asmVersion and not defined(gcc) and not defined(llvm_gcc):
         mov eax, edx
     """
 
-  proc mulInt(a, b: int): int {.compilerProc, noStackFrame.} =
+  proc mulInt(a, b: int): int {.compilerProc, asmNoStackFrame.} =
     asm """
         mov eax, `a`
         mov ecx, `b`
diff --git a/lib/system/jssys.nim b/lib/system/jssys.nim
index 4fc5f479b..a19c456f7 100644
--- a/lib/system/jssys.nim
+++ b/lib/system/jssys.nim
@@ -23,9 +23,9 @@ type
   PCallFrame = ptr TCallFrame
   TCallFrame {.importc, nodecl, final.} = object
     prev: PCallFrame
-    procname: CString
+    procname: cstring
     line: int # current line number
-    filename: CString
+    filename: cstring
 
 var
   framePtr {.importc, nodecl, volatile.}: PCallFrame
@@ -48,7 +48,7 @@ proc getCurrentExceptionMsg*(): string =
 
 proc auxWriteStackTrace(f: PCallFrame): string =
   type
-    TTempFrame = tuple[procname: CString, line: int]
+    TTempFrame = tuple[procname: cstring, line: int]
   var
     it = f
     i = 0
@@ -84,7 +84,7 @@ proc rawWriteStackTrace(): string =
     framePtr = nil
 
 proc raiseException(e: ref E_Base, ename: cstring) {.
-    compilerproc, noStackFrame.} =
+    compilerproc, asmNoStackFrame.} =
   e.name = ename
   if excHandler != nil:
     excHandler.exc = e
@@ -104,7 +104,7 @@ proc raiseException(e: ref E_Base, ename: cstring) {.
     alert(buf)
   asm """throw `e`;"""
 
-proc reraiseException() {.compilerproc, noStackFrame.} =
+proc reraiseException() {.compilerproc, asmNoStackFrame.} =
   if excHandler == nil:
     raise newException(ENoExceptionToReraise, "no exception to reraise")
   else:
@@ -125,7 +125,7 @@ proc raiseIndexError() {.compilerproc, noreturn.} =
 proc raiseFieldError(f: string) {.compilerproc, noreturn.} =
   raise newException(EInvalidField, f & " is not accessible")
 
-proc SetConstr() {.varargs, noStackFrame, compilerproc.} =
+proc SetConstr() {.varargs, asmNoStackFrame, compilerproc.} =
   asm """
     var result = {};
     for (var i = 0; i < arguments.length; ++i) {
@@ -141,7 +141,7 @@ proc SetConstr() {.varargs, noStackFrame, compilerproc.} =
     return result;
   """
 
-proc cstrToNimstr(c: cstring): string {.noStackFrame, compilerproc.} =
+proc cstrToNimstr(c: cstring): string {.asmNoStackFrame, compilerproc.} =
   asm """
     var result = [];
     for (var i = 0; i < `c`.length; ++i) {
@@ -151,7 +151,7 @@ proc cstrToNimstr(c: cstring): string {.noStackFrame, compilerproc.} =
     return result;
   """
 
-proc toJSStr(s: string): cstring {.noStackFrame, compilerproc.} =
+proc toJSStr(s: string): cstring {.asmNoStackFrame, compilerproc.} =
   asm """
     var len = `s`.length-1;
     var result = new Array(len);
@@ -162,7 +162,7 @@ proc toJSStr(s: string): cstring {.noStackFrame, compilerproc.} =
     return result.join("");
   """
 
-proc mnewString(len: int): string {.noStackFrame, compilerproc.} =
+proc mnewString(len: int): string {.asmNoStackFrame, compilerproc.} =
   asm """
     var result = new Array(`len`+1);
     result[0] = 0;
@@ -170,7 +170,7 @@ proc mnewString(len: int): string {.noStackFrame, compilerproc.} =
     return result;
   """
 
-proc SetCard(a: int): int {.compilerproc, noStackFrame.} =
+proc SetCard(a: int): int {.compilerproc, asmNoStackFrame.} =
   # argument type is a fake
   asm """
     var result = 0;
@@ -178,14 +178,14 @@ proc SetCard(a: int): int {.compilerproc, noStackFrame.} =
     return result;
   """
 
-proc SetEq(a, b: int): bool {.compilerproc, noStackFrame.} =
+proc SetEq(a, b: int): bool {.compilerproc, asmNoStackFrame.} =
   asm """
     for (var elem in `a`) { if (!`b`[elem]) return false; }
     for (var elem in `b`) { if (!`a`[elem]) return false; }
     return true;
   """
 
-proc SetLe(a, b: int): bool {.compilerproc, noStackFrame.} =
+proc SetLe(a, b: int): bool {.compilerproc, asmNoStackFrame.} =
   asm """
     for (var elem in `a`) { if (!`b`[elem]) return false; }
     return true;
@@ -194,7 +194,7 @@ proc SetLe(a, b: int): bool {.compilerproc, noStackFrame.} =
 proc SetLt(a, b: int): bool {.compilerproc.} =
   result = SetLe(a, b) and not SetEq(a, b)
 
-proc SetMul(a, b: int): int {.compilerproc, noStackFrame.} =
+proc SetMul(a, b: int): int {.compilerproc, asmNoStackFrame.} =
   asm """
     var result = {};
     for (var elem in `a`) {
@@ -203,7 +203,7 @@ proc SetMul(a, b: int): int {.compilerproc, noStackFrame.} =
     return result;
   """
 
-proc SetPlus(a, b: int): int {.compilerproc, noStackFrame.} =
+proc SetPlus(a, b: int): int {.compilerproc, asmNoStackFrame.} =
   asm """
     var result = {};
     for (var elem in `a`) { result[elem] = true; }
@@ -211,7 +211,7 @@ proc SetPlus(a, b: int): int {.compilerproc, noStackFrame.} =
     return result;
   """
 
-proc SetMinus(a, b: int): int {.compilerproc, noStackFrame.} =
+proc SetMinus(a, b: int): int {.compilerproc, asmNoStackFrame.} =
   asm """
     var result = {};
     for (var elem in `a`) {
@@ -220,7 +220,7 @@ proc SetMinus(a, b: int): int {.compilerproc, noStackFrame.} =
     return result;
   """
 
-proc cmpStrings(a, b: string): int {.noStackFrame, compilerProc.} =
+proc cmpStrings(a, b: string): int {.asmNoStackFrame, compilerProc.} =
   asm """
     if (`a` == `b`) return 0;
     if (!`a`) return -1;
@@ -234,7 +234,7 @@ proc cmpStrings(a, b: string): int {.noStackFrame, compilerProc.} =
 
 proc cmp(x, y: string): int = return cmpStrings(x, y)
 
-proc eqStrings(a, b: string): bool {.noStackFrame, compilerProc.} =
+proc eqStrings(a, b: string): bool {.asmNoStackFrame, compilerProc.} =
   asm """
     if (`a` == `b`) return true;
     if ((!`a`) || (!`b`)) return false;
@@ -300,7 +300,7 @@ type
     setAttributeNode*: proc (attr: ref TNode) {.nimcall.}
 
 when defined(kwin):
-  proc rawEcho {.compilerproc, nostackframe.} =
+  proc rawEcho {.compilerproc, asmNoStackFrame.} =
     asm """
       var buf = "";
       for (var i = 0; i < arguments.length; ++i) {
@@ -312,7 +312,7 @@ when defined(kwin):
 elif defined(nodejs):
   proc ewriteln(x: cstring) = log(x)
   
-  proc rawEcho {.compilerproc, nostackframe.} =
+  proc rawEcho {.compilerproc, asmNoStackFrame.} =
     asm """
       var buf = "";
       for (var i = 0; i < arguments.length; ++i) {
@@ -345,42 +345,42 @@ else:
     node.appendChild(document.createElement("br"))
 
 # Arithmetic:
-proc addInt(a, b: int): int {.noStackFrame, compilerproc.} =
+proc addInt(a, b: int): int {.asmNoStackFrame, compilerproc.} =
   asm """
     var result = `a` + `b`;
     if (result > 2147483647 || result < -2147483648) `raiseOverflow`();
     return result;
   """
 
-proc subInt(a, b: int): int {.noStackFrame, compilerproc.} =
+proc subInt(a, b: int): int {.asmNoStackFrame, compilerproc.} =
   asm """
     var result = `a` - `b`;
     if (result > 2147483647 || result < -2147483648) `raiseOverflow`();
     return result;
   """
 
-proc mulInt(a, b: int): int {.noStackFrame, compilerproc.} =
+proc mulInt(a, b: int): int {.asmNoStackFrame, compilerproc.} =
   asm """
     var result = `a` * `b`;
     if (result > 2147483647 || result < -2147483648) `raiseOverflow`();
     return result;
   """
 
-proc divInt(a, b: int): int {.noStackFrame, compilerproc.} =
+proc divInt(a, b: int): int {.asmNoStackFrame, compilerproc.} =
   asm """
     if (`b` == 0) `raiseDivByZero`();
     if (`b` == -1 && `a` == 2147483647) `raiseOverflow`();
     return Math.floor(`a` / `b`);
   """
 
-proc modInt(a, b: int): int {.noStackFrame, compilerproc.} =
+proc modInt(a, b: int): int {.asmNoStackFrame, compilerproc.} =
   asm """
     if (`b` == 0) `raiseDivByZero`();
     if (`b` == -1 && `a` == 2147483647) `raiseOverflow`();
     return Math.floor(`a` % `b`);
   """
 
-proc addInt64(a, b: int): int {.noStackFrame, compilerproc.} =
+proc addInt64(a, b: int): int {.asmNoStackFrame, compilerproc.} =
   asm """
     var result = `a` + `b`;
     if (result > 9223372036854775807
@@ -388,7 +388,7 @@ proc addInt64(a, b: int): int {.noStackFrame, compilerproc.} =
     return result;
   """
 
-proc subInt64(a, b: int): int {.noStackFrame, compilerproc.} =
+proc subInt64(a, b: int): int {.asmNoStackFrame, compilerproc.} =
   asm """
     var result = `a` - `b`;
     if (result > 9223372036854775807
@@ -396,7 +396,7 @@ proc subInt64(a, b: int): int {.noStackFrame, compilerproc.} =
     return result;
   """
 
-proc mulInt64(a, b: int): int {.noStackFrame, compilerproc.} =
+proc mulInt64(a, b: int): int {.asmNoStackFrame, compilerproc.} =
   asm """
     var result = `a` * `b`;
     if (result > 9223372036854775807
@@ -404,14 +404,14 @@ proc mulInt64(a, b: int): int {.noStackFrame, compilerproc.} =
     return result;
   """
 
-proc divInt64(a, b: int): int {.noStackFrame, compilerproc.} =
+proc divInt64(a, b: int): int {.asmNoStackFrame, compilerproc.} =
   asm """
     if (`b` == 0) `raiseDivByZero`();
     if (`b` == -1 && `a` == 9223372036854775807) `raiseOverflow`();
     return Math.floor(`a` / `b`);
   """
 
-proc modInt64(a, b: int): int {.noStackFrame, compilerproc.} =
+proc modInt64(a, b: int): int {.asmNoStackFrame, compilerproc.} =
   asm """
     if (`b` == 0) `raiseDivByZero`();
     if (`b` == -1 && `a` == 9223372036854775807) `raiseOverflow`();
@@ -472,17 +472,17 @@ proc Ze(a: int): int {.compilerproc.} =
 proc Ze64(a: int64): int64 {.compilerproc.} =
   result = a
 
-proc ToU8(a: int): int8 {.noStackFrame, compilerproc.} =
+proc ToU8(a: int): int8 {.asmNoStackFrame, compilerproc.} =
   asm """
     return `a`;
   """
 
-proc ToU16(a: int): int16 {.noStackFrame, compilerproc.} =
+proc ToU16(a: int): int16 {.asmNoStackFrame, compilerproc.} =
   asm """
     return `a`;
   """
 
-proc ToU32(a: int): int32 {.noStackFrame, compilerproc.} =
+proc ToU32(a: int): int32 {.asmNoStackFrame, compilerproc.} =
   asm """
     return `a`;
   """
@@ -586,7 +586,7 @@ proc genericReset(x: Pointer, ti: PNimType): pointer {.compilerproc.} =
     result = nil
 
 proc ArrayConstr(len: int, value: pointer, typ: PNimType): pointer {.
-                 noStackFrame, compilerproc.} =
+                 asmNoStackFrame, compilerproc.} =
   # types are fake
   asm """
     var result = new Array(`len`);
@@ -620,7 +620,7 @@ proc isObj(obj, subclass: PNimType): bool {.compilerproc.} =
     x = x.base
   return true
 
-proc addChar(x: string, c: char) {.compilerproc, noStackFrame.} =
+proc addChar(x: string, c: char) {.compilerproc, asmNoStackFrame.} =
   asm """
     `x`[`x`.length-1] = `c`; `x`.push(0);
   """
diff --git a/todo.txt b/todo.txt
index 656bd06fc..d3ed9957f 100644
--- a/todo.txt
+++ b/todo.txt
@@ -19,8 +19,6 @@ Bugs
 - docgen: sometimes effects are listed twice
 - 'result' is not properly cleaned for NRVO --> use uninit checking instead
 - blocks can "export" an identifier but the CCG generates {} for them ...
-- osproc execProcesses can deadlock if all processes fail (as experienced
-  in c++ mode)
 
 
 version 0.9.x
@@ -144,11 +142,9 @@ Not essential for 1.0.0
   semantics instead ...
 - implement "closure tuple consists of a single 'ref'" optimization
 - optimize method dispatchers
-- ``with proc `+`(x, y: T): T`` for generic code
 - new feature: ``distinct T with operations``
 - arglist as a type (iterator chaining); variable length type lists for generics
 - implement marker procs for message passing
-- activate more thread tests
 - implement closures that support nesting of *procs* > 1
 - object constructors: static check for fields if discriminator is known at 
   compile time
diff --git a/web/news.txt b/web/news.txt
index 187797b58..f9ac1b66d 100644
--- a/web/news.txt
+++ b/web/news.txt
@@ -41,6 +41,8 @@ News
     - The ``nil`` statement has been deprecated, use an empty ``discard`` instead.
     - ``sockets.select`` now prunes sockets that are **not** ready from the list
       of sockets given to it.
+    - The ``noStackFrame`` pragma has been renamed to ``asmNoStackFrame`` to
+      ensure you only use it when you know what you're doing.
 
 
     Compiler Additions