Merge pull request #1124 from EXetoC/spawn-arg-check

Spawn argument checking.

compiler/semfold.nim

@@ -404,7 +404,7 @@ proc evalOp(m: TMagic, n, a, b, c: PNode): PNode =
      mExit, mInc, ast.mDec, mEcho, mSwap, mAppendStrCh, 
      mAppendStrStr, mAppendSeqElem, mSetLengthStr, mSetLengthSeq, 
      mParseExprToAst, mParseStmtToAst, mExpandToAst, mTypeTrait,
-     mNLen..mNError, mEqRef, mSlurp, mStaticExec, mNGenSym: 
+     mNLen..mNError, mEqRef, mSlurp, mStaticExec, mNGenSym, mSpawn:
     discard
   of mRand:
     result = newIntNodeT(math.random(a.getInt.int), n)

tests/system/tsysspawnbadarg.nim

@@ -0,0 +1,7 @@
+discard """
+  line: 7
+  errormsg: "'spawn' takes a call expression of type void"
+  cmd: "nimrod $target --threads:on $options $file"
+"""
+
+spawn(1)