/// <summary>
/// Derive error info from a type symbol.
/// </summary>
internal bool DeriveUseSiteDiagnosticFromType(ref DiagnosticInfo result, TypeSymbol type)
{
DiagnosticInfo info = type.GetUseSiteDiagnostic();
if (info != null)
{
if (info.HasErrorCode(InternalErrorCode.ERR_BogusType))
{
switch (this.Kind.Switch())
{
case LanguageSymbolKind.Name:
case LanguageSymbolKind.Operation:
case LanguageSymbolKind.Property:
info = new LanguageDiagnosticInfo(InternalErrorCode.ERR_BindToBogus, this);
break;
}
}
}
return(MergeUseSiteDiagnostics(ref result, info));
}
/// <summary>
/// Merges given diagnostic to the existing result diagnostic.
/// </summary>
internal bool MergeUseSiteDiagnostics(ref DiagnosticInfo result, DiagnosticInfo info)
{
if (info == null)
{
return(false);
}
if (info.Severity == DiagnosticSeverity.Error && (info.HasErrorCode(HighestPriorityUseSiteError) || HighestPriorityUseSiteError == null))
{
// this error is final, no other error can override it:
result = info;
return(true);
}
if (result == null || result.Severity == DiagnosticSeverity.Warning && info.Severity == DiagnosticSeverity.Error)
{
// there could be an error of higher-priority
result = info;
return(false);
}
// we have a second low-pri error, continue looking for a higher priority one
return(false);
}