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* @(next) takes Lisp expression as source now.Kaz Kylheku2015-11-201-2/+22
| | | | | | | | | | | * match.c (v_next): Evaluate the source expression as TXR Lisp, unless it is meta-expression or meta-variable, or the compatibility option is set to 124 or lower. In those cases treat it as an expression of the TXR Pattern * txr.1: Updated documentation of @(next) and all relevant examples of @(next) everywhere. Added compatibility notes.
* Renaming html filters to get rid of underscore.Kaz Kylheku2015-11-201-12/+12
| | | | | | | | | | | | | | | | | * filter.c (to_html_k, from_html_k, to_html_relaxed_k): Variables removed. (tohtml_k, tohtml_star_k, fromhtml_k): New keyword symbol variables. (to_html_table): Array renamed to tohtml_table. (to_html_relaxed_table): Renamed to tohtml_star_table. (from_html_table): Renamed to fromhtml_table. (html_encode): Refers to tohtml_k. (html_encode_star): Refers to tohtml_star_k. (html_decode): Refers to fromhtml_k. (filter_init): Initialize new symbol variables. Remove old registrations. Register filters under old names too. * txr.1: Document new names.
* New :to_html_relaxed filter and html-encode*.Kaz Kylheku2015-11-201-1/+19
| | | | | | | | | | | * filter.c (to_html_relaxed_k): New keyword symbol variable. (to_html_relaxed_table): New static array. (html_encode_star): New static function. (filter_init): Initialize new symbol variable. Register new filter. Register html-encode* function. * txr.1: Documented :to_html_relaxed filter and html-encode* function.
* @(rep) as shorthand for @(coll :vars nil).Kaz Kylheku2015-11-201-1/+21
| | | | | | | | | | | | | * match.c (h_coll): Check for rep symbol, and handle similarly to v_coll. Use symbol in error message. (dir_tables_init): Bind rep symbol to h_coll. * parser.y (elems): Don't generate rep_elem phrase structure for the sake of catching "rep outside of output"; this production now conflicts with the intent to allow this. (elem): Add various REP productions which clones of COLL. * txr.1: Documented new @(rep) usage.
* Provide butlast function.Kaz Kylheku2015-11-201-0/+24
| | | | | | | | | | * eval.c (eval_init): Registered butlast intrinsic. * lib.c (butlast): New function. * lib.h (butlast): Declared. * txr.1: Documented butlast.
* Functors: structs callable as functions.Kaz Kylheku2015-11-201-0/+30
| | | | | | | * lib.c (generic_funcall): If an object is used as a function, get its lambda method and call that. * txr.1: Document functors.
* New uslot function and usl macro.Kaz Kylheku2015-11-201-0/+50
| | | | | | | | | | | | | | * struct.c (struct_init): Register uslot intrinsic function. (uslot_fun): New static function. (uslot): New function. * struct.h (uslot): Declared. * share/txr/stdlib/struct.tl (usl): New macro. * lisplib.c (struct_set_entries): Add usl macro. * txr.1: Documented uslot and usl.
* Version 124.txr-124Kaz Kylheku2015-11-141-2/+2
| | | | | | | | | | * RELNOTES: Updated. * configure, txr.1: Bumped version and date. * share/txr/stdlib/ver.tl: Likewise. * txr.vim, tl.vim: Regenerated.
* Implementing *print-base* and ~d format directive.Kaz Kylheku2015-11-141-1/+49
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * debug.c (show_bindings): Use ~d for level, so as not to be influenced by *print-base*. (debug): Use ~d for line numbers. * lib.c (gensym): Use ~d conversion specifier for formatting gensym counter into symbol name. * match.c (LOG_MISMATCH, LOG_MATCH): Use ~d for line number references. (h_skip, h_coll, h_fun, h_chr, match_line_completely, v_skip, v_fuzz, v_gather, v_collect, v_output, v_filter, v_fun, v_assert, v_load, v_line, h_assert, open_data_source): Use ~d for line refs, number of iterations, errno values. * parser.c (repl): Use ~d for prompt line numbers, numbered variables and the expr-<n> string in error messages. * parser.l (yyerrorf, source_loc_str): Use ~d for line numbers. * stream.c (print_base_s): New symbol variable. (formatv): Implement *print-base*. (stdio_maybe_read_error, stdio_maybe_error, stdio_close, pipe_close, open_directory, open_file, open_fileno, open_tail, open_process, run, remove_path): Use ~d for errno values. (stream_init): Initialize print_base_s and register *print-base* special variable. sysif.c (mkdir_wrap, ensure_dir, getcwd_wrap, mknod_wrap, chmod_wrap, symlink_wrap, link_wrap, readlink_wrap, excec_wrap, stat_impl, pipe_wrap, poll_wrap, getgroups_wrap, setuid_wrap, seteuid_wrap, setgid_wrap): Use ~d for errno values and system function results. * txr.1: Documented *print-base* and ~d conversion specifier.
* New global control over float print precision.Kaz Kylheku2015-11-131-5/+52
| | | | | | | | | | | | | | | | | | * configure (have_dbl_decimal_dig): New variable. New configure test to test for DBL_DECIMAL_DIG or __DBL_DECIMAL_DIG__, resulting in FLO_MAX_DIG macro being deposited in config.h. * arith.c (arith_init): Register flo-max-dig variable. * stream.c (print_flo_precision_s): New symbol variable. (formatv): Obtain default precision from *print-flo-precision* special variable, rather than hard coded DBL_DIG. (stream_init): Initialize print_flo_precision_s variable, and register *print-flo-precision* special. * txr.1: Document flo-max-dig, *print-flo-precision*, and change of behavior in format.
* Formatting in generate, giterate heading.Kaz Kylheku2015-11-121-1/+1
| | | | * txr.1: Missing @, added for comma.
* Explanation about mlet circularity.Kaz Kylheku2015-11-121-1/+4
| | | | | * txr.1: mlet circular references are detected at evaluation time, not by the macro.
* Adding revappend and nreconc.Kaz Kylheku2015-11-111-0/+27
| | | | | | | | | | | | | | | * eval.c (eval_init): Register revappend and nreconc intrinsics. * lib.c (list_collect_nreconc): New function. (revlist): New static function. (list_collect_revappend): New function. (revappend, nreconc): New functions. * lib.h (revappend, nreconc): Declared. (list_collect_nreconc, list_collect_revappend): Declared. * txr.1: Documented revappend and nreconc.
* New function: group-reduce.Kaz Kylheku2015-11-101-0/+71
| | | | | | | | | | * eval.c (eval_init): Register group-reduce intrinsic. * hash.c (group_reduce): New function. * hash.h (group_reduce): Declared. * txr.1: Documented group-reduce.
* New block* op; functions return* and sys:abscond*.Kaz Kylheku2015-11-091-2/+93
| | | | | | | | | | | | * eval.c (block_star_s): New symbol variable. (op_block_star): New static function. (do_expand): Handle block* symbol. (return_star, abscond_star): New static functions. (eval_init): Initialize block_star_s variable. Register block* operator and return* and sys:abscond* functions. * txr.1: Documented new operator and functions.
* Variable init forms of for go inside nil block.Kaz Kylheku2015-11-081-6/+14
| | | | | | | | * eval.c (op_for): Establish the block before doing any evaluation, subject to the compatibility option. * txr.1: Updated documentation for for, exchanging steps 1 and 2. Added compatibility notes.
* New iread function.Kaz Kylheku2015-11-071-4/+34
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The read function no longer works like it used to on an interactive terminal because of the support for .. and . syntax on a top-level expression. The iread function is provided which uses a modified syntax that doesn't support these operators on a top-level expression. The parser thus doesn't look one token ahead, and so iread can return immediately. * eval.c (eval_init): Register iread intrinsic function. * parser.c (prime_parser): Only push back the recently seen token when priming for a regular Lisp read. Handle the prime_interactive method by preparing a SECRET_ESCAPE_I token. (lisp_parse_impl): New static function, formed from previous lisp_parse. Takes a boolean argument indicating interactive mode. (prime_parser_post): New function. (lisp_parse): Now a wrapper for lisp_parse_impl which passes a nil to indicate noninteractive read. (iread): New function. * parser.h (enum prime_parser): New member, prime_interactive. (scrub_scanner, iread, prime_parser_post): Declared. * parser.l (prime_scanner): Handle the prime_interactive case the same way as prime_lisp. (scrub_scanner): New function. * parser.y (SECRET_ESCAPE_I): New token type. (i_expr): New nonterminal symbol. Like n_expr, but doesn't support dot or dotdot operators, except in nested subexpressions. (spec): Handle SECRET_ESCAPE_I by way of i_expr. (sym_helper): Before freeing the token lexeme, call scrub_scanner. If the token is registered as the scanner's most recently seen token, the scanner must forget that registration, because it is no longer valid. (parse): Call prime_parser_post. * txr.1: Documented iread.
* Version 123.txr-123Kaz Kylheku2015-11-061-2/+2
| | | | | | | | * RELNOTES: Updated. * configure, txr.1: Bumped version and date. * share/txr/stdlib/ver.tl: Likewise.
* Version 122.txr-122Kaz Kylheku2015-11-051-2/+2
| | | | | | | | | | * RELNOTES: Updated. * configure, txr.1: Bumped version and date. * share/txr/stdlib/ver.tl: Likewise. * txr.vim, tl.vim: Regenerated.
* yield-from can omit form; access initial value.Kaz Kylheku2015-11-041-59/+97
| | | | | | | | | | | | | * share/txr/stdlib/yield.tl (sys:rcv-item): New struct type. (sys:obtain-impl): Handle rcv-item, produced by a no-argument yield-from, which requests an immediate resumption with the previously given resume value. The reply value is renamed the resume value. (yield-from, yield): Form argument is optional. * txr.1: Rewrote obtain and yield documentation with lesser focus on implementation and greater focus on abstract semantics.
* Pattern vars accessed from Lisp now dynamic.Kaz Kylheku2015-11-041-0/+42
| | | | | | | | | | | | | | | * eval.c (set_dyn_env): Static function becomes external. * eval.h (set_dyn_env): Declared. * match.c (eval_with_bindings, eval_progn_with_bindings): Evaluate Lisp code in null lexical environment. Instead install the pattern variables as dynamic, so they shadow global variables. A compatibility check for 121 or earlier provides the old behavior. * txr.1: Document scoping rules, and added compatibility notes.
* Moving sys:capture-cont to call/cc style API.Kaz Kylheku2015-11-021-33/+29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | * unwind.c (revive_cont): Don't wrap cons cell around passed arg; just pass it directly. We don't need that convention any more. * capture_cont: Take functional argument. Pass the captured continuation to the function. If the function returns, return whatever it returned. When resuming, return the continuation argument. (uw_capture_cont): Take functional second argument and pass to capture_cont. Context form becomes third argument. (uw_late_init): Update registration of sys:capture-cont to three arguments, two required. * unwind.h (uw_capture_cont): Declaration updated. * share/txr/stdlib/yield.tl (sys:yield-impl): Not needed any more; all this was doing was implementing a call/cc style interface around sys:capture-cont which can now be used directly. (yield-from): Use sys:capture-cont directly. (suspend): Simplified to the point of triviality with new sys:capture-cont. * txr.1: Documented.
* New range type, distinct from cons cell.Kaz Kylheku2015-11-011-10/+113
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * eval.c (eval_init): Register intrinsic functions rcons, rangep from and to. (eval_init): Register rangep intrinsic. * gc.c (mark_obj): Traverse RNG objects. (finalize): Handle RNG in switch. * hash.c (equal_hash, eql_hash): Hashing for for RNG objects. * lib.c (range_s, rcons_s): New symbol variables. (code2type): Handle RNG type. (eql, equal): Equality for ranges. (less_tab_init): Table extended to cover RNG. (less): Semantics defined for ranges. (rcons, rangep, from, to): New functions. (obj_init): range_s and rcons_s variables initialized. (obj_print_impl): Produce #R notation for ranges. (generic_funcall, dwim_set): Recognize range objects for indexing * lib.h (enum type): New enum member, RNG. MAXTYPE redefined to RNG value. (TYPE_SHIFT): Increased to 5 since there are now 16 type codes. (struct range): New struct type. (union obj): New member rn, of type struct range. (range_s, rcons_s, rcons, rangep, from, to): Declared. (range_bind): New macro. * parser.l (grammar): New rule for recognizing the #R sequence as HASH_R token. * parser.y (HASH_R): New terminal symbol. (range): New nonterminal symbol. (n_expr): Derives the new range symbol. The n_expr DOTDOT n_expr rule produces rcons expression rather than const. * match.c (format_field): Recognize rcons syntax in fields which is now what ranges translate to. Also recognize range object. * tests/013/maze.tl (neigh): Fix code which destructures range as a cons. That can't be done any more. * txr.1: Document ranges.
* Fix case in Compatibility section reference.Kaz Kylheku2015-10-311-1/+1
| | | | * txr.1: Compatibility -> COMPATIBILITY
* Define suspend operator.Kaz Kylheku2015-10-301-35/+95
| | | | | | | | | | * lisplib.c (yield_set_entries): Added "suspend" to end of name. * share/txr/stdlib/yield.tl (suspend): New macro. * txr.1: Documented suspend. Replaced subtly incorect shift/reset implementation example with suspend implementation.
* Version 121.txr-121Kaz Kylheku2015-10-291-2/+2
| | | | | | | | | | * RELNOTES: Updated. * configure, txr.1: Bumped version and date. * share/txr/stdlib/ver.tl: Likewise. * txr.vim, tl.vim: Regenerated.
* Formatting issue under qref.Kaz Kylheku2015-10-291-1/+1
| | | | * txr.1: Improperly terminated .cblk.
* Provide a way to free the continuation stacks.Kaz Kylheku2015-10-291-1/+11
| | | | | | | | | | | | | | | | | | * share/txr/stdlib/yield.tl (sys:obtain-impl): Pass sys:cont-free symbol to each abandoned continuation to release its stack buffer. (obtain): Handle the sys:cont-free symbol in the lambda, so the initial lambda can be treated uniformly with continuation functions. * txr.1: Documented sys:obtain-impl. * unwind.c (sys_cont_free_s): New symbol variable. (cont_mark): Check for null stack pointer and avoid marking. (revive_cont): If arg is sys:cont-free, then free the continuation and return nil. If the continuation has a null stack buffer, throw an error. (uw_late_init): Initialize sys_cont_free_s.
* Finalize obtain continuator function.Kaz Kylheku2015-10-291-0/+10
| | | | | | | | | | * share/txr/stdlib/yield.tl (sys:obtain-impl): Add a finalizer to the returned closure which will feed sys:cont-poison object to the most recently captured continuation. Thus abandoned obtain blocks which have become garbage shall have their unwinding performed. * txr.1: Documented the finalization behavior.
* Unwinding continuations via "poison" value.Kaz Kylheku2015-10-291-0/+8
| | | | | | | | | | | | * unwind.c (sys_cont_poison_s): New symbol variable. (revive_cont): If the argument is the poison symbol, then unwind through the continuation all the way back to revive_cont's own block, instead of to the continuation's very top block. Thus the continuation is not restarted but completely unwound. (uw_late_init): Initialize sys_cont_poison_s. * txr.1: Documented sys:cont-poison.
* Implementing sys:abscond-from operator.Kaz Kylheku2015-10-281-1/+54
| | | | | | | | | | | | | | | | | | | | | * eval.c (sys_abscond_from_s): New symbol variable. (op_abscond_from): New static function. (do_expand): Handle abscond-from like return-from. (eval_init): Initialize sys_abscond_from_s and register sys:abscond-from operator. * share/txr/stdlib/yield.tl (yield-from): Use sys:abscond-from instead of return-from, to avoid tearing down the continuation's resources that it may need when restarted. * txr.1: Documented sys:abscond-from and added a mention to the Delimited Continuations introduction. * unwind.c (uw_abscond_to_exit_point): New static function. (uw_block_abscond): New function. * unwind.h (uw_block_abscond): Declared.
* Doc maintenance under flet and labels.Kaz Kylheku2015-10-281-1/+15
| | | | | | * txr.1: Some wording changes and dialect note that flet and labels do not genearate implict named blocks in the function bodies.
* Fix with-hash-table-iter typo.Kaz Kylheku2015-10-281-1/+1
| | | | | | | * lisplib.c (hash_set_entries): Change with-hash-table-iter to with-hash-iter. * txr.1: Likewise.
* Add obtain/yield macros interface to continuations.Kaz Kylheku2015-10-281-0/+253
| | | | | | | | | | | * lisplib.c (yield_set_entries, yield_instantiate): New static functions. (dlt_register): Registered new functions. * share/txr/stdlib/yield.tl: New file. * txr.1: Documented obtain, yield-from, obtain-block and yield.
* Context form error reporting in sys:capture-cont.Kaz Kylheku2015-10-281-11/+14
| | | | | | | | | | | | | | * unwind.c (sys_capture_cont_s): New variable. (uw_capture_cont): Second argument is now a context form rather than a symbol; eval_error is used for error reporting. The form's operator symbol si used in the error message, or else sys:capture-cont if the context argument is null or missing. (uw_late_init): Initialize sys_capture_cont_s. * unwind.h (uw_capture_cont): Declaration updated. * txr.1: Documented.
* New special macro parameter list parameter :form.Kaz Kylheku2015-10-281-9/+22
| | | | | | | | * eval.c (form_k): New keyword symbol variable. (bind_macro_params): Implement form_k. (eval_init): Initialize form_k. * txr.1: Documented :form parameter.
* Improvement in place macros.Kaz Kylheku2015-10-281-3/+25
| | | | | | | | | | | Expansion of places now gives priority to place macros. Moreover, it iterates over place macro and ordinary macro expansion. * share/txr/stdlib/place.tl (sys:trigger-load): Removed. (sys:pl-expand): Rewritten. * txr.1: Documented.
* TXR gets delimited continuations.Kaz Kylheku2015-10-251-0/+183
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * unwind.c (sys_cont_s): New symbol variable. (uw_pop_block): New function, supporting uw_block_end macro. Special logic is needed for popping blocks now, because a block can be a captured stub at the top of a continuation, which must not be popped in the regular manner. (struct cont): New struct type. (cont_destroy, cont_mark): New static functions. (cont_ops): New static structure. (revive_cont, capture_cont): New static functions. (uw_capture_cont): New functions. (uw_init): Initialize sys_cont_s. Register sys:capture-cont intrinsic. * unwind.h (enum uw_frtype): New enum member UW_CAPTURED_BLOCK. When a block is captured as a stub copy of the prompt block of a delimited continuation, its type is changed from UW_BLOCK to this new type. This does two things: it makes the block invisible to block-related code that does nothing with continuations (code that looks for UW_BLOCK and ignores anything else). Secondly, there is some special handling related to UW_CAPTURED_BLOCK frames. (uw_pop_block, uw_capture_cont): Declared. (uw_block_begin): New local pointer uw_rslt introduced which helps communicate the result variable over to the uw_block_end macro (so we don't have to add a variable argument to the latter). (uw_block_end): Use uw_pop_block instead of uw_pop_frame. * txr.1: Documented delimited continuations.
* Implementing truncate-stream.Kaz Kylheku2015-10-211-0/+15
| | | | | | | | | | | | | | | | | | | | | | | * configure: Test for ftruncate and chsize. * stream.c (unimpl_truncate): New static function. (fill_stream_ops): Default the truncate operation to unimpl_truncate. (null_ops): Initialize truncate to unimpl_truncate. (stdio_truncate): New static function. (stdio_ops, tail_ops): Initialize truncate to stdio_truncate. (pipe_ops, dir_ops, string_ops, byte_in_ops, string_out_ops, strlist_out_ops, cat_stream_ops): Initialize truncate to null, so it gets defaulted by fill_stream_ops. (truncate_stream): New function. (stream_init): Register truncate-stream intrinsic. * stream.h (struct strm_ops): New member, truncate. (strm_ops_init): New truncate argument added to macro. (truncate_stream): Declared. *syslog.c (syslog_strm_ops): Initialize truncate to null. * txr.1: Documented.
* Doc improvements in Structures.Kaz Kylheku2015-10-191-10/+16
| | | | | * txr.1: mention defmeth in Structures intro plus a number of wording changes and corrections.
* defmeth and with-objects formatting fix.Kaz Kylheku2015-10-191-1/+2
| | | | | * txr.1: Bad syntax formatting in defmeth. Missing .desc under with-objects.
* Version 120.txr-120Kaz Kylheku2015-10-181-2/+2
| | | | | | | | | | * RELNOTES: Updated. * configure, txr.1: Bumped version and date. * share/txr/stdlib/ver.tl: Likewise. * txr.vim, tl.vim: Regenerated.
* Support binary specifier in format.Kaz Kylheku2015-10-171-0/+5
| | | | | | | | * stream.c (formatv): New 'b' case along side 'o', handling binary in straightforward way for bignums, and with binary formatting loop code for fixnums. * txr.1: Documented b.
* Streamline handling of struct type arguments.Kaz Kylheku2015-10-171-2/+3
| | | | | | | | | | * struct.c (stype_handle): New static function. (make_struct_type, super, make_struct, static_slot, static_slot_set, static_slot_ensure, slotp, static_slot_p): Use stype_handle, * txr.1: Documented that static-slot and static-slot-set take type as a symbol.
* Fix formatting under caar, cadr, ...Kaz Kylheku2015-10-161-0/+1
| | | | * txr.1: .cblk with no closing .cble.
* Adding defmeth macro and static-slot-ensure.Kaz Kylheku2015-10-161-0/+81
| | | | | | | | | | | | | | | | | * share/txr/stdlib/struct.tl (defmeth): New macro. * struct.c (struct struct_type): New member, dvtypes. (struct_init): Register static-slot-ensure intrinsic. (make_struct_type): Initialize dvtypes of newly instantiated struct_type struct. If a super is specified, add new type to the super's dvtypes. (struct_type_mark): Mark st->dvtypes. (static_slot_ensure): New function. * struct.h (static_slot_ensure): Declared. * txr.1: Documented defmeth and static-slot-ensure.
* Remove use of the system function.Kaz Kylheku2015-10-161-0/+25
| | | | | | | | | | System depends on environment variables, and also causes SIGINT and SIGQUIT to be ignored. * stream.c (sh): Function rewritten in terms of sh, in two platform variants. * txr.1: Documented that sh doesn't use system as of TXR 120.
* Renaming some functions for consistency.Kaz Kylheku2015-10-161-8/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * combi.c (perm_list, perm_str, rperm_list, reperm_gen_fun, rperm_vec, comb_vec, rcomb_list, rcomb_vec, rcomb_str): Follow rename of list_vector to list_vec. * eval.c (vector_list_s): Global variable renamed to vec_list_s. (expand_qquote): Follow vector_list_s to vec_list_s. (eval_init): Follow renames of all identifiers. Functions num-chr, chr-num, vector-list and list-vector are registered under new names, while remaining registered under old names. * eval.h (vector_list_s): Declaration renamed. * filter.c (url_encode): Follow chr_num to chr_int rename. * lib.c (make_like, interpose, shuffle): Follow vector_list to vec_list rename. (tolist, replace, replace_list): Follow list_vector to list_vec rename. (num_chr): Renamed to int_chr. (chr_num): Renamed to chr_int. (vector_list): Renamed to vec_list. (list_vector): Renamed to list_vec. * lib.h (num_chr, chr_num, list_vector, vector_list): * Declarations renamed. * parser.y (vector): Follow vector_list to vec_list rename. * txr.1: Updated documentation for num-chr, chr-num, list-vector and vector-list with new names, and notes about the old names being supported, but obsolescent.
* Adding find-frame function.Kaz Kylheku2015-10-151-2/+57
| | | | | | | | | | | | * unwind.c (uw_find_frame): New function. (uw_late_init): Registered find-frame intrinsic. * unwind.h (uw_find_frame): Declared. * lib.h (default_arg_strict): New inline function. Will not replace nil value with default. * txr.1: Documented find-frame.
* Introspection over catch and handle frames.Kaz Kylheku2015-10-151-0/+159
| | | | | | | | | | | | | | * unwind.c (types_s, jump_s): New symbol variables. (frame_type, catch_frame_type, handle_frame_type): New globals denoting struct types. (uw_get_frames, uw_invoke_catch): New functions. (uw_late_init): Initialize new global variables. Register get-frames and invoke-catch intrinsics. * unwind.h (uw_get_frames, uw_invoke_catch): Declared. * txr.1: Documented frame, catch-frame, handle-frame, get-frames and invoke-catch.
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