From Jason Turner

[using.headers]

Diff to HTML by rtfpessoa

tmp/tmprfc7pvdg/{from.md → to.md} RENAMED
@@ -11,7 +11,7 @@ either `<cassert>` or `<assert.h>` depends each time on the lexically
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  current definition of `NDEBUG`.[^20]
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  A translation unit shall include a header only outside of any external
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  declaration or definition, and shall include the header lexically before
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  the first reference in that translation unit to any of the entities
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- declared in that header.
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  current definition of `NDEBUG`.[^20]
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  A translation unit shall include a header only outside of any external
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  declaration or definition, and shall include the header lexically before
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  the first reference in that translation unit to any of the entities
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+ declared in that header. No diagnostic is required.
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