add unicode library stub with just

IsUpper and IsLetter.

R=r
DELTA=746  (746 added, 0 deleted, 0 changed)
OCL=22743
CL=22750

src/lib/Makefile

@@ -22,6 +22,7 @@ DIRS=\
 	sync\
 	tabwriter\
 	time\
+	unicode\
 
 FILES=\
 	bufio\

src/lib/unicode/Makefile

+# Copyright 2009 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+# DO NOT EDIT.  Automatically generated by gobuild.
+# gobuild -m >Makefile
+O=6
+GC=$(O)g
+CC=$(O)c -w
+AS=$(O)a
+AR=$(O)ar
+
+default: packages
+
+clean:
+	rm -f *.$O *.a $O.out
+
+test: packages
+	gotest
+
+coverage: packages
+	gotest
+	6cov -g `pwd` | grep -v '_test\.go:'
+
+%.$O: %.go
+	$(GC) $*.go
+
+%.$O: %.c
+	$(CC) $*.c
+
+%.$O: %.s
+	$(AS) $*.s
+
+O1=\
+	letter.$O\
+
+unicode.a: a1
+
+a1:	$(O1)
+	$(AR) grc unicode.a letter.$O
+	rm -f $(O1)
+
+newpkg: clean
+	$(AR) grc unicode.a
+
+$(O1): newpkg
+
+nuke: clean
+	rm -f $(GOROOT)/pkg/unicode.a
+
+packages: unicode.a
+
+install: packages
+	cp unicode.a $(GOROOT)/pkg/unicode.a
+

src/lib/unicode/letter_test.go

+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package unicode
+
+import (
+	"testing";
+	"unicode";
+)
+
+var upper = []int{
+	0x41,
+	0xc0,
+	0xd8,
+	0x100,
+	0x139,
+	0x14a,
+	0x178,
+	0x181,
+	0x376,
+	0x3cf,
+	0x1f2a,
+	0x2102,
+	0x2c00,
+	0x2c10,
+	0x2c20,
+	0xa650,
+	0xa722,
+	0xff3a,
+	0x10400,
+	0x1d400,
+	0x1d7ca,
+}
+
+var notupper = []int{
+	0x40,
+	0x5b,
+	0x61,
+	0x185,
+	0x1b0,
+	0x377,
+	0x387,
+	0x2150,
+	0xffff,
+	0x10000,
+}
+
+var letter = []int{
+	0x41,
+	0x61,
+	0xaa,
+	0xba,
+	0xc8,
+	0xdb,
+	0xf9,
+	0x2ec,
+	0x535,
+	0x6e6,
+	0x93d,
+	0xa15,
+	0xb99,
+	0xdc0,
+	0xedd,
+	0x1000,
+	0x1200,
+	0x1312,
+	0x1401,
+	0x1885,
+	0x2c00,
+	0xa800,
+	0xf900,
+	0xfa30,
+	0xffda,
+	0xffdc,
+	0x10000,
+	0x10300,
+	0x10400,
+	0x20000,
+	0x2f800,
+	0x2fa1d,
+}
+
+var notletter = []int{
+	0x20,
+	0x35,
+	0x375,
+	0x620,
+	0x700,
+	0xfffe,
+	0x1ffff,
+	0x10ffff,
+}
+
+export func TestIsLetter(t *testing.T) {
+	for i, r := range(upper) {
+		if !IsLetter(r) {
+			t.Errorf("IsLetter(%#x) = false, want true\n", r);
+		}
+	}
+	for i, r := range(letter) {
+		if !IsLetter(r) {
+			t.Errorf("IsLetter(%#x) = false, want true\n", r);
+		}
+	}
+	for i, r := range(notletter) {
+		if IsLetter(r) {
+			t.Errorf("IsLetter(%#x) = true, want false\n", r);
+		}
+	}
+}
+
+export func TestIsUpper(t *testing.T) {
+	for i, r := range(upper) {
+		if !IsUpper(r) {
+			t.Errorf("IsUpper(%#x) = false, want true\n", r);
+		}
+	}
+	for i, r := range(notupper) {
+		if IsUpper(r) {
+			t.Errorf("IsUpper(%#x) = true, want false\n", r);
+		}
+	}
+	for i, r := range(notletter) {
+		if IsUpper(r) {
+			t.Errorf("IsUpper(%#x) = true, want false\n", r);
+		}
+	}
+}