From a288266f3310e9ba98456c5e968f8ce434be6cc7 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Sat, 19 Jul 2025 16:02:06 -0700
Subject: [PATCH] std.Io.Reader: remove aggressive assert from `fill`

with `.fixed("")` you should still be able to do `fill(1)` and have it
return error.EndOfStream.
---
 lib/std/Io/Reader.zig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/std/Io/Reader.zig b/lib/std/Io/Reader.zig
index f2a1ec7287..87e83ffd67 100644
--- a/lib/std/Io/Reader.zig
+++ b/lib/std/Io/Reader.zig
@@ -990,9 +990,9 @@ pub fn discardDelimiterLimit(r: *Reader, delimiter: u8, limit: Limit) DiscardDel
 /// Returns `error.EndOfStream` if and only if there are fewer than `n` bytes
 /// remaining.
 ///
-/// Asserts buffer capacity is at least `n`.
+/// If the end of stream is not encountered, asserts buffer capacity is at
+/// least `n`.
 pub fn fill(r: *Reader, n: usize) Error!void {
-    assert(n <= r.buffer.len);
     if (r.seek + n <= r.end) {
         @branchHint(.likely);
         return;