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if 1.30-beta is not out yet use nightly
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@@ -61,7 +61,8 @@ $ rustup default beta
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```
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**NOTE** Make sure you have a beta equal to or newer than `1.30-beta`. `rustc
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-V` should return a date newer than the one shown below:
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-V` should return a date newer than the one shown below. If `1.30-beta` is not
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out yet then use the nightly channel for the time being.
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``` console
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$ rustc -V
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