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[null-safety] fix the snippets (#69122)
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@ -186,6 +186,7 @@ class SampleChecker {
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/// Computes the headers needed for each sample file.
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List<Line> get headers {
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return _headers ??= <String>[
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'// @dart = 2.9',
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'// generated code',
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"import 'dart:async';",
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"import 'dart:convert';",
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