Lossen cast

[nielsenko]

Calling

ElementDeclarationResult? getDeclarationFromElement(Element element) {
  return session.resolvedLibrary.getElementDeclaration(element);
}

on a ClassElement is not guaranteed to return a result with a node of type ClassDeclaration (It can be a ClassTypeAlias as well), so the previous cast in declarationAstNode is not safe. However we don't actually only need a AnnotatedNode which is a common base for both ClassDeclaration and ClassTypeAlias.

Fix: #1285

[coveralls]

Pull Request Test Coverage Report for Build 5783812577

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.06%) to 88.807%

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Files with Coverage Reduction	New Missed Lines	%
lib/src/list.dart	2	85.93%

Totals
Change from base Build 5752829848:	-0.06%
Covered Lines:	3253
Relevant Lines:	3663

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💛 - Coveralls