[null-safety] try updating snippets for null safety (#68723)

Add a language version so the snippets do not opt-in automatically.

Fixes #68719
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Jonah Williams 2020-10-22 13:18:06 -07:00 committed by GitHub
parent a655a1778d
commit 16029c3868
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/// Flutter code sample for {{element}}
// @dart = 2.9
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/// Flutter code sample for {{element}}
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/// Flutter code sample for {{element}}
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/// Flutter code sample for {{element}}
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{{description}}

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/// Flutter code sample for {{element}}
// @dart = 2.9
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/// Flutter code sample for {{element}}
// @dart = 2.9
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/// Flutter code sample for {{element}}
// @dart = 2.9
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/// Flutter code sample for {{element}}
// @dart = 2.9
{{description}}

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/// Flutter code sample for {{element}}
// @dart = 2.9
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/// Flutter code sample for {{element}}
// @dart = 2.9
{{description}}

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/// Flutter code sample for {{element}}
// @dart = 2.9
{{description}}

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/// Flutter code sample for {{element}}
// @dart = 2.9
{{description}}

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/// Flutter code sample for {{element}}
// @dart = 2.9
{{description}}