- Create optional with ~ instead of ?. return io::EOF?; becomes return io::EOF~.

- Deprecated use of `?` to create optional.

lib/std/io/stream.c3

@@ -83,7 +83,7 @@ macro usz? read_all(stream, char[] buffer)
 {
 	if (buffer.len == 0) return 0;
 	usz n = stream.read(buffer)!;
-	if (n != buffer.len) return UNEXPECTED_EOF?;
+	if (n != buffer.len) return UNEXPECTED_EOF~;
 	return n;
 }
 
@@ -120,7 +120,7 @@ macro usz? write_all(stream, char[] buffer)
 {
 	if (buffer.len == 0) return 0;
 	usz n = stream.write(buffer)!;
-	if (n != buffer.len) return INCOMPLETE_WRITE?;
+	if (n != buffer.len) return INCOMPLETE_WRITE~;
 	return n;
 }
 
@@ -136,7 +136,7 @@ macro usz? read_using_read_byte(s, char[] buffer)
 		if (catch err = c)
 		{
 			if (err == io::EOF) return len;
-			return err?;
+			return err~;
 		}
 		*cptr = c;
 		len++;
@@ -160,7 +160,7 @@ macro char? read_byte_using_read(s)
 {
 	char[1] buffer;
 	usz read = s.read(&buffer)!;
-	if (read != 1) return io::EOF?;
+	if (read != 1) return io::EOF~;
 	return buffer[0];
 }
 
@@ -205,12 +205,12 @@ macro usz? copy_through_buffer(InStream in, OutStream dst, char[] buffer) @local
 		if (catch err = len)
 		{
 			if (err == io::EOF) return total_copied;
-			return err?;
+			return err~;
 		}
 		if (!len) return total_copied;
 		usz written = dst.write(buffer[:len])!;
 		total_copied += len;
-		if (written != len) return INCOMPLETE_WRITE?;
+		if (written != len) return INCOMPLETE_WRITE~;
 	}
 }
 
@@ -232,8 +232,8 @@ macro usz? read_varint(stream, x_ptr)
 		char? c = stream.read_byte();
 		if (catch err = c)
 		{
-			if (err == io::EOF) return io::UNEXPECTED_EOF?;
-			return err?;
+			if (err == io::EOF) return io::UNEXPECTED_EOF~;
+			return err~;
 		}
 		n++;
 		if (c & 0x80 == 0)
@@ -249,7 +249,7 @@ macro usz? read_varint(stream, x_ptr)
 		x |= (c & 0x7F) << shift;
 		shift += 7;
 	}
-	return math::OVERFLOW?;
+	return math::OVERFLOW~;
 }
 <*
  @require @is_outstream(stream)