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2076 Commits

Author SHA1 Message Date
Brian Anderson
9976bb93d6 Support the space flag in #fmt 2011-04-17 19:50:58 -04:00
Brian Anderson
86a43c24d6 Support + flag in #fmt 2011-04-17 18:19:26 -04:00
Brian Anderson
1bec738c56 Support #fmt precision for bools, with same rules as strings 
Not totally confident this is desirable. The alternative would be to make it a
compile error.
 2011-04-17 17:24:17 -04:00
Brian Anderson
da996d6e6b Fix indentation in syntax-extension-fmt.rs 2011-04-17 17:12:20 -04:00
Brian Anderson
685e820465 Treat char #fmt conversions just like str conversions 
Add missing tests
 2011-04-17 17:06:55 -04:00
Brian Anderson
8f6603f58e Support #fmt precision for signed types 2011-04-17 16:51:17 -04:00
Brian Anderson
4c0aea69da Support #fmt precision for unsigned types 2011-04-17 16:18:25 -04:00
Brian Anderson
c7edcb3a72 Support #fmt precision for string types 2011-04-17 13:10:02 -04:00
Brian Anderson
96e3e29e88 Support left-justification in #fmt conversions 2011-04-16 19:43:29 -04:00
Brian Anderson
f7b68e9edd Add another test for #fmt conversion widths 2011-04-16 18:22:14 -04:00
Brian Anderson
dcfdb02fab Make #fmt support explicit conversion widths 2011-04-16 18:01:17 -04:00
Brian Anderson
07e820089f More tests for #fmt 2011-04-16 18:01:17 -04:00
Patrick Walton
0c288720b6 rustc: Capture type parameters into for-each blocks. Add a test case. 2011-04-15 18:14:29 -07:00
Patrick Walton
e37d9fc2b6 rustc: Use a regular vector instead of a hash table for type descriptors 2011-04-15 17:46:16 -07:00
Patrick Walton
3e922e2ecf stdlib: Add some vector functions: empty, empty_mut, grow_set, and freeze. Change _vec.grow to use uint arguments. 2011-04-15 17:46:16 -07:00
Rafael Ávila de Espíndola
099e094765 Produce PIC code and use -S in the Makefile. 2011-04-15 19:29:13 -04:00
Patrick Walton
cc6a9c8876 rustc: Remove the "boxed" check, and make the static_size_of_tag recursion-eliminating transformation deep 2011-04-15 15:16:06 -07:00
Rafael Ávila de Espíndola
2214b6835d Add a -S option for producing assembly. I will move more of it to 
rust once the necessary APIs are available in C.
 2011-04-15 17:41:14 -04:00
Patrick Walton
790084ced1 rustc: Make fold_ty no longer use an object; introduce walk_ty 2011-04-15 13:01:31 -07:00
Graydon Hoare
232c450957 Work on destructors, not entirely functional yet (no tydesc integration). 2011-04-14 16:50:59 -07:00
Patrick Walton
0387b5a060 rustc: Use the unified result for the type of assignment expressions 2011-04-14 15:28:50 -07:00
Patrick Walton
55ab187c9c rustc: Add a test case for previous commit 2011-04-14 12:51:27 -07:00
Patrick Walton
35e021ed53 rustc: Perform type substitutions when recording locals 2011-04-14 12:33:26 -07:00
Patrick Walton
fee88f79f5 rt: Remove half-baked, incomplete, commented-out print_stack_trace() stub 2011-04-14 11:35:22 -07:00
Patrick Walton
65b7578851 rustc: Remove generalize_ty. Instead, maintain an explicit type parameter substitution list. 2011-04-14 11:24:25 -07:00
Patrick Walton
ec5a60d5e2 rustc: Use union-find for variable substitution 2011-04-14 11:24:25 -07:00
Brian Anderson
99a697b56a Add support for upper-case hex and binary output to #fmt. 
Only works for uints at present. Necessitated the addition of _str.to_upper.
 2011-04-13 22:14:54 -04:00
Brian Anderson
5c0f4c1939 Add more commentary about ExtFmt 2011-04-13 22:14:40 -04:00
Brian Anderson
4844e1c08a Add support for printing uints as lower-case hex to ExtFmt. 
Begin passing an ExtFmt.RT.conv parsed format description to each of the
ExtFmt.RT.conv* functions.
 2011-04-13 22:14:24 -04:00
Brian Anderson
aebdef0cd6 Move #fmt conversion model into ExtFmt.CT namespace 2011-04-13 22:13:21 -04:00
Brian Anderson
44aed626bf Add ExtFmt test for unsigned type 2011-04-13 22:13:04 -04:00
Brian Anderson
330fdd2b04 Fix a typo in test expr-alt-generic-box1.rs 2011-04-13 21:46:20 -04:00
Tim Chevalier
de50efebc2 rm unused import 2011-04-13 15:50:34 -07:00
Tim Chevalier
7c6e6fc5d4 Make expr_while work in typestate_check 
Also did some refactoring in typestate_check. All test cases in
compile-fail that involve uninitialized vars now fail correctly!
(All eight of them, that is.)
 2011-04-13 15:50:34 -07:00
Graydon Hoare
eb33a5307b Remove gc() call from end of lib-map.rs, works on stage0 otherwise (stage0 produces no gc info) 2011-04-13 15:47:05 -07:00
Graydon Hoare
afeb3a417c Fix temporary-spilling logic in trans_args, uncomment most of lib-deque.rs (which now passes on stage0). 2011-04-13 15:21:54 -07:00
Graydon Hoare
0910a7323c Add generic-temporary.rs minimal test showing cause of lib-deque.rs failure on stage0. 2011-04-13 13:21:06 -07:00
Graydon Hoare
2c65e10a9f Fix lib-deque.rs to pass typarams by alias. 2011-04-13 12:29:34 -07:00
Graydon Hoare
80a4b1ba53 Slight updates to match API drift in io, lib-io.rs passes. 2011-04-13 12:05:15 -07:00
Rafael Ávila de Espíndola
01b1d4110d Remove code that is already in llvm for some time. 2011-04-13 14:55:44 -04:00
Graydon Hoare
8e0ecb4d1a Lex numeric escapes, needed for lib-str.rs (which now passes). 2011-04-13 11:25:11 -07:00
Rafael Ávila de Espíndola
3e081d20e5 Typo. 2011-04-13 14:11:28 -04:00
Rafael Ávila de Espíndola
e7b8db2e63 Enable alias analysis and the function attributes pass. 
The C API extension is already upstream, we can drop the local copy once
the bots are updated.
 2011-04-13 13:54:08 -04:00
Tim Chevalier
63e87c102d typestate_check can now handle expr_block, expr_if, and expr_binary 
(caveat for the latter: it assumes that binary operations are strict;
a TODO is to detect or and and and correctly reflect that they're lazy
in the second argument). I had to add an ann field to ast.block,
resulting in the usual boilerplate changes.

Test cases that currently work (if you uncomment the typestate pass
in the driver) (all these are under test/compile-fail):

fru-typestate
ret-uninit
use-uninit
use-uninit-2
use-uninit-3
 2011-04-12 19:03:52 -07:00
Patrick Walton
de0175abed rustc: Switch to indices for type parameters 2011-04-12 15:10:40 -07:00
Patrick Walton
e11e8754de rustc: Add "float" as a type to the pretty printer 2011-04-12 15:10:39 -07:00
Tim Chevalier
d7e8818414 Further work on typestate. Handles expr_rec and expr_assign now. 
Also changed the ts_ann field on statements to be an ann instead,
which explains most of the changes.

As well, got rid of the "warning: no type for expression" error
by filling in annotations for local decls in typeck (not sure whether
this was my fault or not).

Finally, in bitv, added a clone() function to copy a bit vector,
and fixed is_true, is_false, and to_str to not be nonsense.
 2011-04-12 14:31:46 -07:00
Rafael Ávila de Espíndola
87d17c3a2c Add LLVMAddLoopIdiomPass. 2011-04-12 16:13:31 -04:00
Rafael Ávila de Espíndola
424d3e3837 Add LLVMAddCorrelatedValuePropagationPass. 2011-04-12 16:08:13 -04:00
Rafael Ávila de Espíndola
8e5109d4ed Add LLVMAddScalarReplAggregatesPassSSA. 2011-04-12 15:59:38 -04:00
Graydon Hoare
5f6abdc0e8 Un-XFAIL generic-tag-corruption.rs. 2011-04-12 12:58:43 -07:00
Graydon Hoare
7c55938125 Make glue always pass-by-alias and rename "scalar_or_boxed" concept to "immediate" 2011-04-12 12:48:46 -07:00
Graydon Hoare
f374fa44b6 Tighten up condition on use of opaque_tag, remove blunt hammer of alias arg-casting in trans_args. 2011-04-12 12:48:46 -07:00
Rafael Ávila de Espíndola
832ad0e041 Add LLVMAddEarlyCSEPass to the .def file. 2011-04-12 15:48:11 -04:00
Rafael Ávila de Espíndola
dd6fc607a4 Enable more optimizations. 2011-04-12 15:33:39 -04:00
Brian Anderson
73eecbd0ca Factor out creation of calls into ExtFmt.RT 2011-04-11 21:55:03 -04:00
Brian Anderson
bba245f3e6 Add support for bool, char to extfmt. 
XFAIL syntax-extension-fmt in rustboot.
 2011-04-11 21:54:03 -04:00
Brian Anderson
37f87161cc Move ExtFmt compile-time functions into their own module 2011-04-11 21:51:23 -04:00
Brian Anderson
c41796f2ca Use correct indentation for ExtFmt.rs 2011-04-11 21:51:23 -04:00
Brian Anderson
ce85b9eb7b Make ExtFmt call its own functions instead of others defined in std 2011-04-11 21:51:23 -04:00
Brian Anderson
d4d0144bcf Move extfmt parsing into standard library 2011-04-11 21:51:23 -04:00
Brian Anderson
5a36786634 Move the extfmt data model into the standard library. 2011-04-11 21:51:23 -04:00
Patrick Walton
9d9790c7f5 rustc: Add a uint hash function 2011-04-11 16:54:05 -07:00
Patrick Walton
e0faf57313 rustc: Factor out expr_ty() into expr_ann() and expr_ty() 2011-04-11 15:05:39 -07:00
Graydon Hoare
d218df02bf Add new minimal testcase showing generic tag memory corruption. 2011-04-11 15:00:18 -07:00
Rafael Ávila de Espíndola
fcb344799a Add a hack to force the linker to fetch Object.o 2011-04-11 15:49:45 -04:00
Rafael Ávila de Espíndola
cca6335c26 Implement the "attempted dynamic environment-capture" error in rustc. 2011-04-11 15:35:01 -04:00
Brian Anderson
1f04c3dcef Un-XFAIL expr-block-fn.rs 
It mysteriously works now.
 2011-04-10 16:25:09 -04:00
Patrick Walton
3efb7f5459 rustc: Push down types for all expressions; add logic for recv and send 2011-04-08 18:14:31 -07:00
Graydon Hoare
35573144c5 Remove silly legacy glue-offset encoding, predicate runtime adjustments by ABI. LLVM should inline most glue now. 2011-04-09 00:54:46 +00:00
Marijn Haverbeke
c0d0b717ee Fix codemap.lookup_pos 
Previously, it would place every single location in the first
file of the crate that was parsed.
 2011-04-09 01:57:48 +02:00
Patrick Walton
129c8392af rustc: Rename "demand" to "pushdown" in the typechecker and explain more clearly what it's for 2011-04-08 16:22:03 -07:00
Marijn Haverbeke
1af3174fe3 Move to single-uint file-position representation. 
This makes passing them around cheaper. There is now a table (see
front/codemap.rs) that is needed to transform such an uint into an
actual filename/line/col location.

Also cleans up the span building in the parser a bit.
 2011-04-09 01:05:18 +02:00
Marijn Haverbeke
094d31f5e4 Make lexer buffer the whole file 
This way, it won't have to go through a bunch of calls for each
byte fetched.
 2011-04-09 01:05:18 +02:00
Patrick Walton
573bc5ad01 rustc: Resolve ty_locals 2011-04-08 15:41:08 -07:00
Patrick Walton
5355811859 rustc: Add the ability to fold over annotations 2011-04-08 15:21:49 -07:00
Rafael Ávila de Espíndola
ad7aff8203 Remove unused function. 2011-04-08 16:03:35 -04:00
Rafael Ávila de Espíndola
70bc63a3af Remove unused function. 2011-04-08 15:14:26 -04:00
Tim Chevalier
97d0f76c63 fix long lines 2011-04-08 17:46:46 +00:00
Tim Chevalier
9c001af07c Implemented computing prestates and poststates for a few expression forms. 
The typestate checker (if it's uncommented) now correctly rejects a
trivial example program that has an uninitialized variable.
 2011-04-08 17:46:46 +00:00
Marijn Haverbeke
6109dba305 Disable effect checking in rustboot 2011-04-08 18:44:58 +02:00
Brian Anderson
b883ec4c9d Avoid some gotchas with logging macros 
I think this is sufficient to eliminate multiple evaluation and the
possibility of accidental miscompilation from the logging macros.
 2011-04-07 22:53:16 -04:00
Brian Anderson
0abccc6370 Add a test case for calling generic functions taking alias args with box types 2011-04-07 22:23:07 -04:00
Brian Anderson
a4f8de382a Add an XFAILed test for blocks that result in functions 2011-04-07 22:13:39 -04:00
Brian Anderson
d2d42fd4c7 Make block results work for generic types 
I think just about every type can be used as a block result now. There's quite
a proliferation of tests here, but they all test slightly different things and
some are split out to remain XFAILed. The tests of generic vectors are still
XFAILed because generic aliased boxes still don't work in general.
 2011-04-07 21:58:36 -04:00
Patrick Walton
afa6d85d61 stdlib: Add a simple union-find data structure 2011-04-07 18:02:01 -07:00
Patrick Walton
f28a9d8f52 rustc: Pointer cast when crossing a box boundary for statically-sized elements in trans_index() 2011-04-07 18:02:01 -07:00
Marijn Haverbeke
009e01dbe7 add FIXME related to the -fno-strict-aliasing workaround 2011-04-08 02:23:33 +02:00
Marijn Haverbeke
53cc673db1 Re-add a read_byte() method to buf_reader objs 
This was removed because of the repetition, but doing single-byte
reads in terms of read_bytes (which allocates a vec) is needlessly
slow. This change speeds up parsing by 22%.

(Eventually, we won't be able to escape handling the buffering in the
stdlib itself.)
 2011-04-08 02:23:14 +02:00
Marijn Haverbeke
bb56253015 Initialize two more variables to keep darwin tinderbox happy 2011-04-08 00:59:45 +02:00
Marijn Haverbeke
32e62d0151 add a -parse-only option to rustc 
(undocumented, only used for profiling the parser)
 2011-04-08 00:46:41 +02:00
Marijn Haverbeke
973023030e add -O2 when compiling rt, fix warnings triggered by optimizer 2011-04-08 00:41:52 +02:00
Lindsey Kuper
21b31a350a Updated test to use 'check' rather than just logging results. 2011-04-07 15:22:34 -07:00
Marijn Haverbeke
9a7576fe2c Move to macro-based logging checks in the C++ code 
No functions should be called for log statements that turn out to be
inactive.
 2011-04-07 15:15:30 -07:00
Patrick Walton
6dcf6218b1 rustc: Pointer cast when autodereferencing boxed tag types 2011-04-07 15:12:48 -07:00
Patrick Walton
9b35051143 rustc: Use the name "opaque_tag", not "tag", for opaque tags 2011-04-07 15:12:48 -07:00
Lindsey Kuper
1092bbfff0 Support for self-calls that take arguments. 
Nicer parsing of self-calls (expr_self_method nodes inside expr_call
nodes, rather than a separate expr_call_self) makes typechecking
tractable.  We can now write self-calls that take arguments and return
values (see: test/run-pass/obj-self-*.rs).
 2011-04-07 14:26:34 -07:00
Marijn Haverbeke
39774e88b4 Add a very basic crate-dump utility 
'rustc -ls [cratelib]' will now dump out a list of symbols defined by
the crate, as well as a short description of what they are.
 2011-04-07 14:19:19 -07:00
Marijn Haverbeke
d678dad434 Fix problem in metadata writer 
It was creating non-multiple-of-four section sizes, which, for some
reason, presumably by LLVM, were clipped, rather than padded, to be a
multiple of four.
 2011-04-07 14:19:17 -07:00
Marijn Haverbeke
ac3026412b Revise EBML reader API 
New one is less stateful, easier to work with.
 2011-04-07 14:19:16 -07:00
Patrick Walton
0f5f467dc0 rustc: Remove useless call to type_of() in trans_rec() 2011-04-07 13:55:02 -07:00
Patrick Walton
08bf4d1f19 "xfail-stage0", not "XFAIL-stage0" 2011-04-07 13:53:11 -07:00
Patrick Walton
3236e6008c XFAIL lib-option.rs in stage0 due to crash on Darwin on tinderbox 2011-04-07 13:44:20 -07:00
Patrick Walton
a97a200413 Fix effect on deref-lval 2011-04-07 13:30:50 -07:00
Patrick Walton
015c0d0d59 rustc: Allow dereference expressions to be used as lvalues. Add a test case. 2011-04-07 12:51:27 -07:00
Rafael Ávila de Espíndola
b4422cca21 Add a -O option and change the Makefile to use it. 2011-04-07 15:42:06 -04:00
Patrick Walton
ddf96ac3a8 rustc: Reindent line. Puts out burning tinderbox. 2011-04-07 12:01:48 -07:00
Patrick Walton
cd6962f29d rustc: Link to external tag discriminants. Un-XFAIL test/run-pass/lib-option.rs. 2011-04-07 11:42:40 -07:00
Patrick Walton
2a894cabc2 Merge branch 'master' of github.com:graydon/rust 2011-04-07 10:14:25 -07:00
Rafael Ávila de Espíndola
25320da099 Run optimizations. 
It is always on for now just to make sure the bots are happy. If they
are, I will add a -O option and update the makefile.
 2011-04-07 12:12:21 -04:00
Tim Chevalier
2e90bd94de Continued sketching out code for checking states against preconditions. 
It's still sketchy. I added a typestate annotation field to statements
tagged stmt_decl or stmt_expr, because a stmt_decl statement has a typestate
that's different from that of its child node. This necessitated trivial
changes to a bunch of other files all over to the compiler. I also added a
few small standard library functions, some of which I didn't actually end
up using but which I thought might be useful anyway.
 2011-04-06 17:58:18 -07:00
Patrick Walton
d9da43984b Merge branch 'master' of github.com:graydon/rust 2011-04-06 10:25:32 -07:00
Graydon Hoare
36d75d6391 Minimal testcase for next bootstrap blocker. 2011-04-06 08:33:24 -07:00
Graydon Hoare
5e98cd9472 Remove reference to nonexistent ast.module from typestate_check.rs, stage1 doesn't like it. 2011-04-06 04:18:12 +00:00
Graydon Hoare
52abd912c0 Brute force and ignorance workaround for tag-and-generic-obj; un-XFAIL it. 2011-04-05 21:08:13 -07:00
Graydon Hoare
8382990627 Add new minimal test for current blocker on bootstrapping. 2011-04-05 17:27:55 -07:00
Tim Chevalier
86d4601827 More work on typestate. Sketched out code for computing and checking prestates and poststates. Still a long ways away. 2011-04-06 00:17:06 +00:00
Lindsey Kuper
4fc8de1969 Last pieces of self-call support. 
The last few pieces of the hack that lets us use trans.trans_call() to
translate self-calls, plus a fix for the parser buy that was
preventing self-call expressions from getting past parsing.
test/run-pass/obj-self.rs works now (as in it actually prints "hi!"
twice!).
 2011-04-05 16:26:31 -07:00
Lindsey Kuper
b8bb2e118e Further on the path toward self-awareness. 
Mostly:

  * Merciless refactoring of trans.rs so that trans_call can work for
    self-calls as well as other kinds of calls

Also:

  * Various changes to go with having idents, rather than exprs, in
    expr_call_self AST nodes
  * Added missing case for SELF token to token.to_str()
 2011-04-05 14:54:48 -07:00
Graydon Hoare
8703c8067f FIx native wrapper generation to handle more arg types. 2011-04-05 21:52:48 +00:00
Lindsey Kuper
361ee5a68b Oops -- if we're going to use the pretty-printer, we need it to work. 2011-04-05 11:55:14 -07:00
Lindsey Kuper
ba537fa5f5 Knocking out a quick fixme: pretty-printing exprs in error messages. 2011-04-05 11:55:12 -07:00
Graydon Hoare
70e5457d7c Make box prefix operator and box type carry mutability flag. 2011-04-04 15:44:15 -07:00
Patrick Walton
f10a5bbad0 rustc: Make type_of() return the type of the wrapper for native functions. lib-map now compiles, but fails to work properly. 2011-04-03 15:23:58 -07:00
Brian Anderson
bd9f45446a Begin comparing vectors from the correct address 
Start at the first element instead of the address of the vector.
 2011-04-03 03:09:20 -04:00
Graydon Hoare
8e9c5b96fb Change rust_vec to have a 16-byte header, to 16-byte-align vec-body data. Major perf win. 2011-04-02 19:05:12 -07:00
Brian Anderson
1326d424c9 Add more tests for alt expressions 2011-04-02 20:35:51 -04:00
Brian Anderson
99901bdbc4 Add FIXMEs around type handling in trans_if, trans_alt 2011-04-02 20:35:51 -04:00
Brian Anderson
21fb49ad95 Join the results of alt arms so alt can be used as an expression. 
Un-XFAIL expr-alt.rs.
 2011-04-02 20:35:50 -04:00
Brian Anderson
203e33b611 Make join_results branch into the join block even when only one edge is live. 
I don't don't totally understand the implications of this but it makes the
behavior consistent for all live edges, which is going to make joining the
arms of an alt expression work correctly.
 2011-04-02 20:35:50 -04:00
Brian Anderson
6e6acaa39a Fail on non-exhaustive alt matches 2011-04-02 20:35:50 -04:00
Brian Anderson
9d0a505d61 Terminate fail blocks by making their ends unreachable. 
This will make implementing default alt arms simpler.
 2011-04-02 20:35:50 -04:00
Graydon Hoare
4f90c88b4d Write typarams for variants. Typecheck gets as far as ty.rs now. 2011-04-01 18:53:08 -07:00
Graydon Hoare
5b7961b641 Encode ty_native ebml node for native types so typechecker has something to work with. 2011-04-01 18:34:13 -07:00
Graydon Hoare
c077da553d Remove typestate_check reference to nonexistent ast.init node; rustc compiling itself notices what rustboot did not :) 2011-04-01 18:33:47 -07:00
Graydon Hoare
23f18a096f Re-enable typestate_check in build, was lost during merge. Sorry. 2011-04-01 17:23:56 -07:00
Graydon Hoare
0397c05f42 Support for passing native types through metadata/creader. 2011-04-01 17:04:51 -07:00
Graydon Hoare
2a2ea6351d Comment out import for not-yet-compiling typestate_check. 2011-04-01 17:04:07 -07:00
Graydon Hoare
3971110d7f Guh. Actually commit the staged undo-of-indentation. Forgotten git staging wins again. 2011-04-01 16:04:22 -07:00
Graydon Hoare
7d88e63ec8 Switch private linkage to local, re-indent trans.rs. 2011-04-01 15:01:46 -07:00
Patrick Walton
3a8b0be1cb rustc: Write symbols for native items into the crate metadata 2011-04-01 14:18:46 -07:00
Patrick Walton
a0eb9c814b rustc: Don't try to write symbols into the metadata for nullary tags. Puts out burning tinderbox. 2011-04-01 14:14:10 -07:00
Patrick Walton
6dc452335a rustc: Get tag variants from the crate metadata 2011-04-01 13:02:44 -07:00
Patrick Walton
ec9d7abf8c rustc: Have tag_variants() return a new variant_info structure instead of an AST node 2011-04-01 11:37:31 -07:00
Tim Chevalier
3130348ee1 Started adding support for typestate checking. 
I added a new field to the ast "ann" type for typestate information.
Currently, the field contains a record of a precondition bit vector and
postcondition vector, but I tried to structure things so as to make
it easy to change the representation of the typestate annotation type.
I also had to add annotations to some syntactic forms that didn't have
them before (fail, ret, be...), with all the boilerplate changes
that that would imply.

The main call to the typestate_check entry point is commented out and
the actual pre-postcondition algorithm only has a few cases
implemented, though the overall AST traversal is there. The rest of
the typestate algorithm isn't implemented yet.
 2011-04-01 11:27:32 -07:00
Patrick Walton
69a34b992b rustc: Remove useless call to tag_variant_with_id() 2011-04-01 10:59:59 -07:00
Brian Anderson
1bc06bc59b Cleanup typos and newlines 2011-04-01 00:05:13 -04:00
Brian Anderson
efb738153c Add an XFAILed test for treating alts as expressions 2011-03-31 23:23:27 -04:00
Brian Anderson
dcf04ffbad Un-XFAIL expr-if-box.rs 2011-03-31 23:15:11 -04:00
Brian Anderson
f16e7242d2 Initialize the alloca used to retrieve boxed block results to null. 
This allows blocks to be used in conditional constructs where the block may
not ever execute: the drop glue will notice that it was never used and ignore
it.

Also, beef up the comments.
 2011-03-31 23:15:11 -04:00