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pjmlp an hour ago

It still doesn't, this is a compiler specific language extension.

You won't find anything on ISO/IEC 9899:2024 about tail calls, like it happens on Scheme.

https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3220.pdf

Section 3.5 of R7RS.

https://standards.scheme.org/official/r7rs.pdf

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wahern 35 minutes ago | parent [-]

A formal technical specification (TS) extension is already being drafted: https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3582.pdf That's a step up from the usual proposals. I'm not sure what criteria is used to decide whether to first create a TS vs just incorporating a change into the working draft of the next standard.[1] _Defer also seems to be taking the TS route.[2]

1. https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3886.pdf

2. https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3928.pdf

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leoc 12 minutes ago | parent | next [-]

There's some discussion of how C29 defer ended up in a TS at https://thephd.dev/c2y-the-defer-technical-specification-its... .

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pjmlp 24 minutes ago | parent | prev [-]

Well, even if that lands on the official standard, that means C29 as probable release year for C2y, plus adoption of the exact form across compilers to be able to rely on it being available.

	▲	Someone 10 minutes ago \| parent [-]
		Plus the fact that an implementation that recognizes the new syntax and produces an error whenever it encounters it will be conforming. On such an implementation, the feature is available but useless.