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7 changes: 5 additions & 2 deletions lib/src/model/model_element.dart
Original file line number Diff line number Diff line change
Expand Up @@ -588,8 +588,11 @@ abstract class ModelElement
final lineInfo = unitElement.lineInfo;

final nameOffset = element.firstFragment.nameOffset;
assert(nameOffset != null && nameOffset >= 0,
'Invalid location data, $nameOffset, for element: $fullyQualifiedName');
// TODO(scheglov): For extension types, or with primary constructors
// and declaring formal parameters, the field has no declaration, so
// no name offset.
// assert(nameOffset != null && nameOffset >= 0,
// 'Invalid location data, $nameOffset, for element: $fullyQualifiedName');
if (nameOffset != null && nameOffset >= 0) {
return lineInfo.getLocation(nameOffset);
}
Expand Down