an early 6g limitation forced the use of

string(b)[0:n]
instead of the more direct string(b[0:n]).
convert to the more direct form.

R=r
DELTA=5  (0 added, 0 deleted, 5 changed)
OCL=27082
CL=27140

src/lib/bufio_test.go

@@ -135,7 +135,7 @@ func readBytes(buf *BufRead) string {
 		nb++;
 	}
 	// BUG return string(b[0:nb]) ?
-	return string(b)[0:nb]
+	return string(b[0:nb])
 }
 
 // Call Read to accumulate the text of a file

src/lib/fmt/format.go

@@ -222,7 +222,7 @@ func (f *Fmt) integer(a int64, base uint, is_signed bool, digits *string) string
 		buf[i] = ' ';
 		i--;
 	}
-	return string(buf)[i+1:nByte];
+	return string(buf[i+1:nByte]);
 }
 
 // Fmt_d64 formats an int64 in decimal.

src/lib/syscall/errstr_darwin.go

@@ -231,7 +231,7 @@ func str(val int64) string {  // do it here rather than with fmt to avoid depend
 		val /= 10;
 	}
 	buf[i] = byte(val + '0');
-	return string(buf)[i:len(buf)];
+	return string(buf[i:len(buf)]);
 }
 
 func Errstr(errno int64) string {

src/lib/syscall/errstr_linux.go

@@ -281,7 +281,7 @@ func str(val int64) string {  // do it here rather than with fmt to avoid depend
 		val /= 10;
 	}
 	buf[i] = byte(val + '0');
-	return string(buf)[i:len(buf)];
+	return string(buf[i:len(buf)]);
 }
 
 func Errstr(errno int64) string {