Avi Kivity 74df67776b bytes_ostream: convert write_placeholder from enable_if to concepts ...

Concepts are easier to read and result in better error messages.

This change also tightens the constraint from "std::is_fundamental" to
"std::integral". The differences are floating point values, nullptr_t,
and void. The latter two are illegal/useless to write, and nobody uses
floating point values for list lengths, so everything still compiles.

Closes #8326

2021-03-22 12:00:07 +01:00

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