fixes #271

compiler/semcall.nim

@@ -84,15 +84,34 @@ proc resolveOverloads(c: PContext, n, orig: PNode,
         getProcHeader(best.calleeSym), getProcHeader(alt.calleeSym),
         args])
 
-proc instantiateGenericConverters(c: PContext, n: PNode, x: TCandidate) {.
-                                  noinline.}=
-  for i in 1 .. <n.len:
-    var a = n.sons[i]
-    if a.kind == nkHiddenCallConv and a.sons[0].kind == nkSym and
-        isGenericRoutine(a.sons[0].sym):
-      let finalCallee = generateInstance(c, a.sons[0].sym, x.bindings, n.info)
-      a.sons[0].sym = finalCallee
-      a.sons[0].typ = finalCallee.typ
+
+proc instGenericConvertersArg*(c: PContext, a: PNode, x: TCandidate) =
+  if a.kind == nkHiddenCallConv and a.sons[0].kind == nkSym and
+      isGenericRoutine(a.sons[0].sym):
+    let finalCallee = generateInstance(c, a.sons[0].sym, x.bindings, a.info)
+    a.sons[0].sym = finalCallee
+    a.sons[0].typ = finalCallee.typ
+    #a.typ = finalCallee.typ.sons[0]
+
+proc instGenericConvertersSons*(c: PContext, n: PNode, x: TCandidate) =
+  assert n.kind in nkCallKinds
+  if x.genericConverter:
+    for i in 1 .. <n.len:
+      instGenericConvertersArg(c, n.sons[i], x)
+
+proc IndexTypesMatch(c: PContext, f, a: PType, arg: PNode): PNode = 
+  var m: TCandidate
+  initCandidate(m, f)
+  result = paramTypesMatch(c, m, f, a, arg, nil)
+  if m.genericConverter and result != nil:
+    instGenericConvertersArg(c, result, m)
+
+proc ConvertTo*(c: PContext, f: PType, n: PNode): PNode = 
+  var m: TCandidate
+  initCandidate(m, f)
+  result = paramTypesMatch(c, m, f, n.typ, n, nil)
+  if m.genericConverter and result != nil:
+    instGenericConvertersArg(c, result, m)
 
 proc semResolvedCall(c: PContext, n: PNode, x: TCandidate): PNode =
   assert x.state == csMatch
@@ -111,8 +130,7 @@ proc semResolvedCall(c: PContext, n: PNode, x: TCandidate): PNode =
       if ContainsGenericType(result.typ): result.typ = errorType(c)
       return
   result = x.call
-  if x.genericConverter:
-    instantiateGenericConverters(c, result, x)
+  instGenericConvertersSons(c, result, x)
   result.sons[0] = newSymNode(finalCallee, result.sons[0].info)
   result.typ = finalCallee.typ.sons[0]