http://d.puremagic.com/issues/show_bug.cgi?id=5775

           Summary: "body" keyword is unnecessary
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: alvaro.segura@gmail.com


--- Comment #0 from Alvaro <alvaro.segura@gmail.com> 2011-03-23 14:46:55 PDT ---
D already has a long list of keywords, and those reserved words can't be used as identifiers. "body" in particular is a common noun that programmers would gladly use as variable name in physics simulation, astronomy, mechanics, games, health, etc. I think "body" can be removed from D with no harm, and with the benefit of allowing the name as identifier.

Rationale: Functions in C and derived languages have always had a body and they never needed a keyword. In D, "body" is used to mark the actual body of a function after the optional "in" and/or "out" contract blocks. From the documentation:

in{
    ...contract preconditions...
}
out (result){
    ...contract postconditions...
}
body{
    ...code...
}

But the body keyword can be omitted and still interpret the code correctly given the rule: "An unnamed {} block right after an in{} or out{} block when defining a function, MUST be the function's body".

Thus, the above code would become:

in{
    ...contract preconditions...
}
out (result){
    ...contract postconditions...
}
{
    ...code...
}

and be perfectly understandable, with the benefit of one less keyword.

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bearophile_hugs@eml.cc changed:

           What    |Removed                     |Added
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                 CC|                            |bearophile_hugs@eml.cc


--- Comment #1 from bearophile_hugs@eml.cc 2011-03-23 15:43:22 PDT ---
Considering the strong resistance against adding new kewords to D, in D there are several unused keywords, like "typedef", "macro", "body", "delete", "cent", "ucent"...

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Jonathan M Davis <jmdavisProg@gmx.com> changed:

           What    |Removed                     |Added
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                 CC|                            |jmdavisProg@gmx.com


--- Comment #2 from Jonathan M Davis <jmdavisProg@gmx.com> 2011-03-23 15:55:57 PDT ---
cent and ucent _should_ be kept around. They're _supposed_ to be unused keywords at this point. The idea is that if/when we need to add 128 bit integers to the language, we already have keywords for them. That way, we'll be able to add them without breaking code.

macro should likely be kept in case we actually do something with AST macros (or some other macro-like mechanism) in a future version of the language.

We may or may not care about keeping typedef once the construct that it's currently used has been removed. We could probably remove it. The same goes for delete.

body... Well, I tend to agree that one is totally unnecessary. It probably simplifies the parsing a bit, but unless it's needed to keep the grammar context-free (which it might be, depending on what the exact grammar is for in, out, and body blocks - though I doubt it), it should be able to be removed. However, since it's in the language and its use hasn't changed at all over time (as far as I know), Waler at least thought that we should have it, and unless something about the situation or his opinion has changed in the interim, I doubt that he'll want to get rid of it.

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla@digitalmars.com
         Resolution|                            |WONTFIX


--- Comment #3 from Walter Bright <bugzilla@digitalmars.com> 2012-01-20 19:00:36 PST ---
{ ... } { ... } just looks wrong. Hence the body keyword.

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