From dfce396cf865e5cc05f46f3079e25c5acb98a4c3 Mon Sep 17 00:00:00 2001
From: g-w1 <jacoblevgw@gmail.com>
Date: Fri, 9 Oct 2020 16:34:39 -0400
Subject: [PATCH] friendly error message for zig run with no args

---
 src/main.zig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/main.zig b/src/main.zig
index b43086cccd..a4c2f4f47b 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -1269,6 +1269,10 @@ fn buildOutputType(
         fatal("one zig source file is required to run `zig test`", .{});
     }
 
+    if (link_objects.items.len == 0 and root_src_file == null and c_source_files.items.len == 0 and arg_mode == .run) {
+        fatal("one source file is required to run `zig run`", .{});
+    }
+
     const root_name = if (provided_name) |n| n else blk: {
         if (arg_mode == .zig_test) {
             break :blk "test";