From fc310ee7bcbe7b96cc46f993277cc3933e4a0fda Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Tue, 1 Jul 2025 09:27:14 -0700
Subject: [PATCH] std.io.Reader: fix appendRemaining

---
 lib/std/Build/Cache.zig | 6 +++++-
 lib/std/io/Reader.zig   | 3 +--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/lib/std/Build/Cache.zig b/lib/std/Build/Cache.zig
index dfc1b14742..82a7b80d41 100644
--- a/lib/std/Build/Cache.zig
+++ b/lib/std/Build/Cache.zig
@@ -690,7 +690,11 @@ pub const Manifest = struct {
             const size = iter.next() orelse return error.InvalidFormat;
             const inode = iter.next() orelse return error.InvalidFormat;
             const mtime_nsec_str = iter.next() orelse return error.InvalidFormat;
-            const digest_str = iter.next() orelse return error.InvalidFormat;
+            const digest_str = iter.next() orelse {
+                std.debug.print("contents:\n{s}\n", .{file_contents});
+                @breakpoint();
+                return error.InvalidFormat;
+            };
             const prefix_str = iter.next() orelse return error.InvalidFormat;
             const file_path = iter.rest();
 
diff --git a/lib/std/io/Reader.zig b/lib/std/io/Reader.zig
index 47f820bdec..a9e790a437 100644
--- a/lib/std/io/Reader.zig
+++ b/lib/std/io/Reader.zig
@@ -266,10 +266,9 @@ pub fn appendRemaining(
             error.EndOfStream => break,
             error.ReadFailed => return error.ReadFailed,
         };
-        if (n >= dest.len) {
+        if (n > dest.len) {
             r.end = n - dest.len;
             list.items.len += dest.len;
-            if (n == dest.len) return;
             return error.StreamTooLong;
         }
         list.items.len += n;