Also, add `current-directory-for-user' and `srcloc->string', and
adjust the way that source-location paths are reported to be
relative to `current-directory-for-user'.
The `#%module-begin' of `racket/base' and `scheme/base' now introduces
a suitable `configure-runtime' submodule, instead of using the
`module->language-info' path.
A submodule is a lot easier to work with, as illustrated by the
removal of the `racket/private/lang' and `scheme/private/lang'
languages.
Also, add `#%printing-module-begin', which is the old `#%module-begin'
(i.e., the one that doesn't introduce a `configure-runtime' submodule).
Also cleaned up implementation; only generates syntax for requested part(s) of
source location, and is more intelligent about calculation of relative paths.
The `lazy-require' form expands to `define-runtime-module-path-index',
whch doesn't work right at phase levels other than 0. Work around the
problem by generating a submodule to hold the
`define-runtime-module-path-index' form.
This repair fixes `raco exe' on certain uses of `match', which in turn
uses `lazy-require' at compile time.
Also, use `register-external-module' to generate appropriate
dependencies on lazily loaded modules.
Separate parameters for props to serialize and those to transfer.
Make syntax?/list? checks on attributes explicit.
Also add continuation barrier around metafunction application.
Support for break clauses complicates expansion to `for/fold/derived';
a new `syntax/for-body' library provides a helper for macros that need
to split a `for'-style body into a prefix part and wrappable part.
The new parameter (and supporting environment variables and
command-line flags) can bytecode lookup to a tree other than
where a source file resides, so that sources and generated
compiled files can be kept separate. It also supports storing
bytecode files in a version-specific location (either with
the source or elsewhere).
