Function signature with no function body

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According to the Go language specification.

A function declaration may omit the body. Such a declaration provides the signature for a function implemented outside Go, such as an assembly routine.

In this case, the Ceil function is implemented by an architecture specific assembly file for 386 in floor_386.s. Both the amd64 and arm architectures each have an assembly file that implements Ceil() as well, but those assembly files are just glue to call the unexported ceil() function.

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