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Fix two minor issues in the tutorial.
Remove an extraneous 'then', and replace 'second' with 'first'.
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@ -226,9 +226,9 @@ let monster_size: int = 50;
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~~~~
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Local variables may shadow earlier declarations, as in the previous example:
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Local variables may shadow earlier declarations, as in the previous example:
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`monster_size` was first declared as a `float`, and then then a second
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`monster_size` was first declared as a `float`, and then a second
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`monster_size` was declared as an int. If you were to actually compile this
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`monster_size` was declared as an int. If you were to actually compile this
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example, though, the compiler will determine that the second `monster_size` is
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example, though, the compiler will determine that the first `monster_size` is
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unused and issue a warning (because this situation is likely to indicate a
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unused and issue a warning (because this situation is likely to indicate a
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programmer error). For occasions where unused variables are intentional, their
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programmer error). For occasions where unused variables are intentional, their
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name may be prefixed with an underscore to silence the warning, like `let
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name may be prefixed with an underscore to silence the warning, like `let
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