Trim remaining expr/stmt from stdlib (#6742)

lib/pure/collections/sharedstrings.nim

@@ -87,10 +87,10 @@ proc newSharedString*(s: string): SharedString =
   result.len = len
 
 when declared(atomicLoadN):
-  template load(x): expr = atomicLoadN(addr x, ATOMIC_SEQ_CST)
+  template load(x): untyped = atomicLoadN(addr x, ATOMIC_SEQ_CST)
 else:
   # XXX Fixme
-  template load(x): expr = x
+  template load(x): untyped = x
 
 proc add*(s: var SharedString; t: cstring; len: Natural) =
   if len == 0: return

lib/pure/osproc.nim

@@ -841,7 +841,7 @@ elif not defined(useNimRtl):
       var attr: Tposix_spawnattr
       var fops: Tposix_spawn_file_actions
 
-      template chck(e: expr) =
+      template chck(e: untyped) =
         if e != 0'i32: raiseOSError(osLastError())
 
       chck posix_spawn_file_actions_init(fops)

lib/pure/typetraits.nim

@@ -21,7 +21,7 @@ proc name*(t: typedesc): string {.magic: "TypeTrait".}
   ##
   ##   proc `$`*(T: typedesc): string = name(T)
   ##
-  ##   template test(x): stmt =
+  ##   template test(x): typed =
   ##     echo "type: ", type(x), ", value: ", x
   ##
   ##   test 42