From 539e90e26d86b7e8fbc81f069a062beb7a43edb3 Mon Sep 17 00:00:00 2001
From: Timon Kruiper <timonkruiper@gmail.com>
Date: Fri, 2 Oct 2020 19:59:00 +0200
Subject: [PATCH] Print error when running `zig test/run` without a source file

Closes #6498
---
 src/main.zig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/main.zig b/src/main.zig
index f1883230ec..d1017a911d 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -1210,6 +1210,10 @@ fn buildOutputType(
         fatal("translate-c expects exactly 1 source file (found {})", .{c_source_files.items.len});
     }
 
+    if (root_src_file == null and (arg_mode == .zig_test or arg_mode == .run)) {
+        fatal("one zig source file is required to run this command", .{});
+    }
+
     const root_name = if (provided_name) |n| n else blk: {
         if (arg_mode == .zig_test) {
             break :blk "test";