From 53a32feef0b2a4cfb8dbc84bb60a7a636034d1af Mon Sep 17 00:00:00 2001
From: Jakub Matraszek <jakub.matraszek@gmail.com>
Date: Sat, 11 Mar 2017 10:36:14 +0100
Subject: [PATCH] #3814: Fallback to src/bin/main.rs for bins

---
 src/cargo/util/toml.rs |  7 ++++++-
 tests/build.rs         | 21 +++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/cargo/util/toml.rs b/src/cargo/util/toml.rs
index 5f41f49f44a..b0e94850398 100644
--- a/src/cargo/util/toml.rs
+++ b/src/cargo/util/toml.rs
@@ -1270,7 +1270,12 @@ fn normalize(package_root: &Path,
                 if package_root.join(&default_bin_path.0).exists() {
                     default_bin_path // inferred from bin's name
                 } else {
-                    PathValue(Path::new("src").join("main.rs"))
+                    let path = PathValue(Path::new("src").join("main.rs"));
+                    if package_root.join(&path.0).exists() {
+                        path
+                    } else {
+                        PathValue(Path::new("src").join("bin").join("main.rs"))
+                    }
                 }
             });
             let mut target = Target::bin_target(&bin.name(), package_root.join(&path.0),
diff --git a/tests/build.rs b/tests/build.rs
index 433e2ed51e0..dfa6241beab 100644
--- a/tests/build.rs
+++ b/tests/build.rs
@@ -2849,3 +2849,24 @@ fn run_proper_binary() {
     assert_that(p.cargo_process("run").arg("--bin").arg("other"),
                 execs().with_status(0));
 }
+
+#[test]
+fn run_proper_binary_main_rs() {
+    let p = project("foo")
+        .file("Cargo.toml", r#"
+            [package]
+            name = "foo"
+            authors = []
+            version = "0.0.0"
+            [[bin]]
+            name = "foo"
+        "#)
+        .file("src/lib.rs", "")
+        .file("src/bin/main.rs", r#"
+            fn main() {
+            }
+        "#);
+
+    assert_that(p.cargo_process("run").arg("--bin").arg("foo"),
+                execs().with_status(0));
+}