fix test failure from trying to assume_init too much

beepster4096 · beepster4096 · commit 7c5a895a89e9 · 2021-11-02T22:47:27.000-07:00
diff --git a/library/std/src/io/copy.rs b/library/std/src/io/copy.rs
@@ -103,7 +103,7 @@ impl<I: Write> BufferedCopySpec for BufWriter<I> {
                             return Ok(len);
                         }
 
-                        init = read_buf.initialized_len();
+                        init = read_buf.initialized_len() - bytes_read;
 
                         // SAFETY: ReadBuf guarantees all of its filled bytes are init
                         unsafe { buf.set_len(buf.len() + bytes_read) };

Original file line number	Diff line number	Diff line change
`@@ -103,7 +103,7 @@ impl<I: Write> BufferedCopySpec for BufWriter<I> {`
`103`	`103`	`return Ok(len);`
`104`	`104`	`}`
`105`	`105`
`106`		`- init = read_buf.initialized_len();`
	`106`	`+ init = read_buf.initialized_len() - bytes_read;`
`107`	`107`
`108`	`108`	`// SAFETY: ReadBuf guarantees all of its filled bytes are init`
`109`	`109`	`unsafe { buf.set_len(buf.len() + bytes_read) };`