Fix tests/parallel/tguard2.nim

Author: zah

compiler/semdata.nim

@@ -63,7 +63,7 @@ type
       # to the user.
     efWantStmt, efAllowStmt, efDetermineType, efExplain,
     efAllowDestructor, efWantValue, efOperand, efNoSemCheck,
-    efNoEvaluateGeneric, efInCall, efFromHlo,
+    efNoEvaluateGeneric, efInCall, efFromHlo, efNoSem2Check,
     efNoUndeclared
       # Use this if undeclared identifiers should not raise an error during
       # overload resolution.

compiler/semexprs.nim

@@ -2079,7 +2079,7 @@ proc tryExpr(c: PContext, n: PNode, flags: TExprFlags = {}): PNode =
   var err: string
   try:
     result = semExpr(c, n, flags)
-    if result != nil:
+    if result != nil and efNoSem2Check notin flags:
       trackStmt(c, c.module, result, isTopLevel = false)
     if c.config.errorCounter != oldErrorCount:
       result = nil

compiler/sigmatch.nim

@@ -1935,7 +1935,9 @@ proc localConvMatch(c: PContext, m: var TCandidate, f, a: PType,
   var call = newNodeI(nkCall, arg.info)
   call.add(f.n.copyTree)
   call.add(arg.copyTree)
-  result = c.semTryExpr(c, call)
+  # XXX: This would be much nicer if we don't use `semTryExpr` and
+  # instead we directly search for overloads with `resolveOverloads`:
+  result = c.semTryExpr(c, call, {efNoSem2Check})
 
   if result != nil:
     if result.typ == nil: return nil