* module/language/elisp/bindings.scm (global?): New function.
* module/language/elisp/compile-tree-il.scm (lexical-binding): New
variable.
(bind-lexically?): If lexical binding is enabled, bind lexically
unless a special binding exists.
(compile-%set-lexical-binding-mode): New function.
* module/language/elisp/lexer.scm (lexical-binding-regexp): New
variable.
(lex): Return a `set-lexical-binding-mode!' token if a comment is
found while reading the first line.
* module/language/elisp/parser.scm (get-expression): Add support for
`set-lexical-binding-mode!' tokens.
* module/language/elisp/runtime/function-slot.scm: Import and re-export
the `%set-lexical-binding-mode' special form.
* test-suite/tests/elisp-compiler.test
("Let and Let*")["lambda args inside lexical-let"]: Update.
* module/language/elisp/bindings.scm: Use `(srfi srfi-9)'.
(bindings-type): Remove low-level record type definition and replace
with...
(bindings): ...this, an SRFI-9 record type. All uses changed.
(mark-global-needed!): Rename to...
(mark-global!): ...this. All callers changed.
(map-globals-needed): Rename to...
(map-globals): ...this. All callers changed.
* module/language/elisp/bindings.scm:
* module/language/elisp/compile-tree-il.scm:
* module/language/elisp/lexer.scm:
* module/language/elisp/parser.scm:
* module/language/elisp/runtime.scm:
* module/language/elisp/runtime/function-slot.scm:
* module/language/elisp/runtime/macro-slot.scm: Ensure that all
top-level forms and comments are separated by exactly one newline.
Remove blank lines in most procedure bodies. Delete trailing
whitespace.
Signed-off-by: Andy Wingo <wingo@pobox.com>
* module/language/elisp/compile-tree-il.scm: Move dynamic binding to one place
and changed names that refer to `fluids' for dynamic binding.
* module/language/elisp/bindings.scm: Changed names referring to `fluids'.
* module/language/elisp/README: Document it.
* module/language/elisp/bindings.scm: New fields in bindings data structure
to keep track of lexical bindings for symbols.
* module/language/elisp/compile-tree-il.scm: Implement lexical-let(*).
* test-suite/tests/elisp-compiler.test: Test lexical scoping with lexical-let.
* module/language/elisp/README: Document this.
* module/language/elisp/compile-tree-il.scm: Implement it here, pass bindings all around the compilation.
* module/language/elisp/bindings.scm: New module with symbol-tracking abilities needed for this.
