From 6a1fd3c69db486df7a805d211e484c60efe294ae Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Wed, 28 Jan 2026 00:01:41 -0800
Subject: [PATCH] std.Io.File.MultiReader: make checkAnyError exclude
 EndOfStream

---
 lib/std/Build/Step/Run.zig      |  6 ++----
 lib/std/Io/File/MultiReader.zig | 10 ++++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/lib/std/Build/Step/Run.zig b/lib/std/Build/Step/Run.zig
index 4d3cda54c9..55fee9a286 100644
--- a/lib/std/Build/Step/Run.zig
+++ b/lib/std/Build/Step/Run.zig
@@ -1385,14 +1385,12 @@ fn runCommand(
             break :term spawnChildAndCollect(run, interp_argv.items, &environ_map, has_side_effects, options, fuzz_context) catch |e| {
                 if (!run.failing_to_execute_foreign_is_an_error) return error.MakeSkipped;
                 if (e == error.MakeFailed) return error.MakeFailed; // error already reported
-                return step.fail("unable to spawn interpreter {s}: {s}", .{
-                    interp_argv.items[0], @errorName(e),
-                });
+                return step.fail("unable to spawn interpreter {s}: {t}", .{ interp_argv.items[0], e });
             };
         }
         if (err == error.MakeFailed) return error.MakeFailed; // error already reported
 
-        return step.fail("failed to spawn and capture stdio from {s}: {s}", .{ argv[0], @errorName(err) });
+        return step.fail("failed to spawn and capture stdio from {s}: {t}", .{ argv[0], err });
     };
 
     const generic_result = opt_generic_result orelse {
diff --git a/lib/std/Io/File/MultiReader.zig b/lib/std/Io/File/MultiReader.zig
index 08ad76000c..7a0f8de068 100644
--- a/lib/std/Io/File/MultiReader.zig
+++ b/lib/std/Io/File/MultiReader.zig
@@ -17,7 +17,8 @@ pub const Context = struct {
     err: ?Error,
 };
 
-pub const Error = Allocator.Error || File.ReadStreamingError || Io.ConcurrentError;
+pub const Error = UnendingError || error{EndOfStream};
+pub const UnendingError = Allocator.Error || File.Reader.Error || Io.ConcurrentError;
 
 /// Trailing:
 /// * `contexts: [len]Context`
@@ -126,13 +127,14 @@ pub fn reader(mr: *MultiReader, index: usize) *Io.Reader {
 }
 
 /// Checks for errors in all streams, prioritizing `error.Canceled` if it
-/// occurred anywhere.
-pub fn checkAnyError(mr: *const MultiReader) Error!void {
+/// occurred anywhere, and ignoring `error.EndOfStream`.
+pub fn checkAnyError(mr: *const MultiReader) UnendingError!void {
     const contexts = mr.streams.contexts();
-    var other: Error!void = {};
+    var other: UnendingError!void = {};
     for (contexts) |*context| {
         if (context.err) |err| switch (err) {
             error.Canceled => |e| return e,
+            error.EndOfStream => continue,
             else => |e| other = e,
         };
     }