explicit.go:21:5: error: incompatible types in assignment (need explicit conversion)
   explicit.go:26:5: error: incompatible types in assignment (type has no methods)
   explicit.go:27:5: error: incompatible types in assignment (need explicit conversion)
   explicit.go:30:6: error: incompatible types in assignment (need explicit conversion; missing method ‘N’)
   explicit.go:33:7: error: invalid type conversion (need explicit conversion; missing method ‘N’)
   explicit.go:36:5: error: incompatible types in assignment

R=rsc
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=31805
CL=31807

R=gri
APPROVED=gri
DELTA=30  (25 added, 0 deleted, 5 changed)
OCL=31796
CL=31799

R=rsc
DELTA=130  (68 added, 6 deleted, 56 changed)
OCL=31798
CL=31798

literals and when the parser hits an unexpected EOF.  Also,
disallow newlines in character literals.

R=gri
APPROVED=gri
DELTA=23  (15 added, 1 deleted, 7 changed)
OCL=31790
CL=31797

excluding import data,
no yacc node has type Type* anymore.

0 reduce/reduce conflicts.

R=ken
OCL=31793
CL=31795

R=rsc
DELTA=337  (165 added, 119 deleted, 53 changed)
OCL=31786
CL=31794

R=rsc
DELTA=31  (8 added, 2 deleted, 21 changed)
OCL=31778
CL=31792

consts in the same factored block

	const (
		X = Y;
		Y = 2;
	)

R=ken
OCL=31782
CL=31782

R=rsc
APPROVED=rsc
DELTA=65  (29 added, 17 deleted, 19 changed)
OCL=31775
CL=31777

R=rsc
DELTA=113  (74 added, 14 deleted, 25 changed)
OCL=31776
CL=31776

R=rsc
APPROVED=rsc
DELTA=41  (0 added, 0 deleted, 41 changed)
OCL=31773
CL=31773

R=rsc
APPROVED=rsc
DELTA=689  (497 added, 169 deleted, 23 changed)
OCL=31755
CL=31772

introduce NodeList* type in compiler to replace OLIST.
this clarifies where lists can and cannot occur.
list append and concatenation are now cheap.
the _r rules are gone from yacc.
rev and unrev are gone.
no more lists of lists.

the representation of assignments is a bit clunkier.
split into OAS (1=1) and OAS2 (2 or more on one side).

delete dead chanrecv3 code.

delay construction of func types.

R=ken
OCL=31745
CL=31762

R=rsc
DELTA=11  (0 added, 0 deleted, 11 changed)
OCL=31760
CL=31760

R=rsc
DELTA=99  (32 added, 22 deleted, 45 changed)
OCL=31759
CL=31759

R=rsc
DELTA=20  (0 added, 12 deleted, 8 changed)
OCL=31758
CL=31758

- added a few TODOs

R=r
DELTA=4  (2 added, 0 deleted, 2 changed)
OCL=31751
CL=31756

R=rsc
DELTA=34  (33 added, 0 deleted, 1 changed)
OCL=31752
CL=31754

- still TODO: ignoring struct fields.

R=rsc
DELTA=309  (240 added, 2 deleted, 67 changed)
OCL=31750
CL=31750

- renamed Program -> SourceFile
- added Package node representing the AST for an entire package
- added filter function to create a source file mimicking the
  interface of an entire package

parser:
- parser entry to parse entire packages
- unified naming of parser entry points
- factored out entry points into new file (interface.go)

gofmt:
- extended to accept single .go files, and package paths:
  gofmt file.go	     	    // formatting of a single file
  gofmt -x file.go	    // interface of a single file
  gofmt -x ./MyPackage	    // interface of a local package
  gofmt -x math		    // interface of a $GOROOT relative package

Various adjustments in dependent files, documentation.

R=rsc
DELTA=634  (369 added, 153 deleted, 112 changed)
OCL=31743
CL=31748

R=rsc
DELTA=5  (0 added, 0 deleted, 5 changed)
OCL=31740
CL=31742

R=rsc
DELTA=15  (8 added, 2 deleted, 5 changed)
OCL=31738
CL=31738

considered running, so WaitStop doesn't lock up and
breakpoints get installed and uninstalled.  We also don't try
to detach from them, since that will fail.

R=rsc
APPROVED=rsc
DELTA=35  (26 added, 2 deleted, 7 changed)
OCL=31683
CL=31731

R=rsc
APPROVED=r
DELTA=146  (142 added, 0 deleted, 4 changed)
OCL=31654
CL=31716

R=rsc
DELTA=3  (3 added, 0 deleted, 0 changed)
OCL=31693
CL=31714

R=rsc
DELTA=1  (0 added, 0 deleted, 1 changed)
OCL=31708
CL=31713

container for values.

Instead of having one evaluator function that returns a
generic Value, there is now an evaluator function for each
generalized type that simply returns a native type.

The compiler is more type-safe now because there are almost no
type conversions at evaluation time and it's impossible to
invoke a nil evaluator function during evaluation.  This also
makes ideals and pointers really clean.

As an added bonus, expression evaluation should be faster
because it doesn't require heap allocation for every
intermediate value, type switches, or lots of conversions to
and from Value.  It also involves fewer function calls.

R=rsc
APPROVED=rsc
DELTA=431  (280 added, 115 deleted, 36 changed)
OCL=31705
CL=31709

R=rsc
DELTA=23  (4 added, 7 deleted, 12 changed)
OCL=31701
CL=31703

than io.Readers and io.Writers.
change the Encoder/Decoder protocol so that each message is preceded by its length in bytes.

R=rsc
DELTA=468  (119 added, 23 deleted, 326 changed)
OCL=31700
CL=31702

R=rsc
DELTA=5  (4 added, 1 deleted, 0 changed)
OCL=31690
CL=31692

pointer types, supports literals, identifiers, type-checking
most unary and binary operators, "compiling" a few unary and
binary operators, and assignment and declaration statements.

R=rsc
APPROVED=rsc
DELTA=1751  (1751 added, 0 deleted, 0 changed)
OCL=31309
CL=31691

	1) terminate outstanding calls on the client when we see EOF from server
	2) allow data to drain on server before closing the connection

R=rsc
DELTA=41  (23 added, 4 deleted, 14 changed)
OCL=31687
CL=31689

1. use CONNECT instead of GET.
   CONNECT has exactly the meaning
   we want; most of the time people
   connect to ip:port; we're connecting
   to /_goRPC_

2. wait for a successful HTTP response
   before assuming we are connected to
   the RPC protocol.  this allows better
   error reporting and also keeps the
   protocol alternating between speakers,
   so that the buffering in the HTTP request
   reader cannot accidentally eat some
   RPC bytes too.

gotest sometimes hangs, but not in HTTP.

gotest -match=Unknown hangs every few runs
even in a clean client.

R=r
DELTA=117  (57 added, 44 deleted, 16 changed)
OCL=31656
CL=31685

R=rsc
APPROVED=rsc
DELTA=81  (53 added, 3 deleted, 25 changed)
OCL=31651
CL=31675

R=rsc
DELTA=17  (8 added, 0 deleted, 9 changed)
OCL=31670
CL=31674

R=gri
APPROVED=gri
DELTA=5  (5 added, 0 deleted, 0 changed)
OCL=31673
CL=31673

R=rsc
APPROVED=rsc
DELTA=49  (49 added, 0 deleted, 0 changed)
OCL=31568
CL=31671

R=rsc
DELTA=159  (110 added, 29 deleted, 20 changed)
OCL=31646
CL=31652

only when there's an error.

R=rsc
APPROVED=rsc
DELTA=3  (0 added, 2 deleted, 1 changed)
OCL=31650
CL=31650

R=gri
DELTA=15  (6 added, 5 deleted, 4 changed)
OCL=31649
CL=31649