Now analyzes over magics instead of symbol names; but dosn't compile for me

compiler/ast.nim

@@ -639,7 +639,8 @@ type
     mEqIdent, mEqNimrodNode, mSameNodeType, mGetImpl,
     mNHint, mNWarning, mNError,
     mInstantiationInfo, mGetTypeInfo, mNGenSym,
-    mNimvm, mIntDefine, mStrDefine, mRunnableExamples
+    mNimvm, mIntDefine, mStrDefine, mRunnableExamples,
+    mException
 
 # things that we can evaluate safely at compile time, even if not asked for it:
 const

compiler/semstmts.nim

@@ -733,7 +733,7 @@ proc semRaise(c: PContext, n: PNode): PNode =
     # check if the given object inherits from Exception
     var base = typ.lastSon
     while true:
-      if base.sym.name.s == "Exception":
+      if base.sym.magic == mException:
         break
       if base.lastSon == nil:
         localError(n.info, "raised object of type $1 does not inherit from Exception", [typ.sym.name.s])

lib/system.nim

@@ -463,7 +463,7 @@ type
     line*: int          ## line number of the proc that is currently executing
     filename*: cstring  ## filename of the proc that is currently executing
 
-  Exception* {.compilerproc.} = object of RootObj ## \
+  Exception* {.compilerproc, magic: "Exception".} = object of RootObj ## \
     ## Base exception class.
     ##
     ## Each exception has to inherit from `Exception`. See the full `exception