[racket-dev] `#%declare' and cross-phase persistent modules

When compiling a fresh git head clone, I still get some cross-phase
persistence errors (see below). Is this my fault, or are some packages
still missing the declaration?


raco setup: --- checking package dependencies ---
raco setup:
raco setup: error: during making for
<pkgs>/errortrace-doc/errortrace/scribblings
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/errortrace-lib/errortrace
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/errortrace-lib/errortrace
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/errortrace-lib/errortrace
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/errortrace-lib/errortrace
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/errortrace-lib/errortrace
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/errortrace-lib/errortrace/lang
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/algol60
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/drracket/drscheme
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/drracket/drracket
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/drracket/drracket/private
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/drracket/scribble/tools
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/drracket/scribblings/tools
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/drracket/scribblings/tools
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/drracket/scribblings/tools
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/drracket/scribblings/drracket
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/drracket/drracket/private
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/drracket/scribblings/drracket
raco setup:   module: does not satisfy cross-phase persistent grammar
raco setup:
raco setup: error: during making for <pkgs>/drracket/drracket/private
raco setup:   module: does not satisfy cross-phase persistent grammar

On Mon, Jul 22, 2013 at 12:18 PM, Matthew Flatt <mflatt at cs.utah.edu> wrote:
> As of v5.90.0.2 (pending), to declare a cross-phase persistent module,
> the module body must include
>
>  (#%declare #:cross-phase-persistent)
>
> If the module declaration fails to meet the syntactic and import
> constraints of a cross-phase persistent module, then a syntax error is
> reported.
>
> This change is backward-incompatible in two ways:
>
>  * Module declarations that are intended as cross-phase persistent
>    won't be, anymore, until a `#%declare' form is added.
>
>    I think cross-phase persistence is new enough --- and the old, quiet
>    inference of persistence is sufficiently distressing --- that this
>    won't be much of an issue.
>
>  * The grammar of fully-expanded modules now includes `#%declare'
>    forms.
>
>    Programs that process fully-expanded modules are not common, but I
>    expect that they exist outside of the main distribution. Those
>    programs will need to be updated. Meanwhile, they won't break until
>    they see a module that has a `#%declare' form, which won't happen
>    often (at least for the near future).
>
> Although `#:cross-phase-persistent' is the only keyword recognized by
> `#%declare' initially, we'll add more. One possibility is a declaration
> that corresponds to `compile-enforce-module-constants'.
>
> I named the form `#%declare' instead of `declare' to avoid conflicts,
> and also because I expect the form to be used more often in macro
> expansions than directly, so it seems like a "#%" kind of form.
>
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