Whatever happened to the 'entry' keyword?

Question

While cruising through my white book the other day, I noticed in the list of C keywords. entry is one of the keywords on that list.

It is reserved f

Answer 1

To complement the accepted answer 'entry' is mentioned in K&R1:

2.3 Keywords

The following identifiers are reserved for use as keywords, and may not be used otherwise

int extern else

char register for

float typedef do

double static while

struct goto switch

union return case

long sizeof default

short break entry

unsigned continue

auto if

and here:

The entry keyword is not currently implemented by any compiler but is reserved for future use. Some implementations also reserve the words 'fortran' and 'asm'.

Then in the Rationale for the ANSI C language (C89) it is mentioned here:

3.1.1 Keyword

[...]

The keywords 'entry' 'fortran', and 'asm' have not been included since they were either never used, or are not portable. Uses of 'fortran' and 'asm' as keywords are not as common extensions.