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book: typo fixes (#251)

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Seiichi Uchida
2022-09-18 22:55:12 +09:00
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book/en-us/02-usability.md
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@@ -153,7 +153,7 @@ actually returns a constant at runtime, which causes illegal production.
C++11 provides `constexpr` to let the user explicitly declare that the function or
object constructor will become a constant expression at compile time.
This keyword explicitly tells the compiler that it should verify that `len_foo`
should be a compile-time constant expression. Constant expression.
should be a compile-time constant expression.
In addition, the function of `constexpr` can use recursion: