From d6cf5f60dd8908e769d8cba64a6c3d5897d73e28 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pedro=20C=C3=B4rte-Real?= <pedro@pedrocr.net>
Date: Fri, 2 Oct 2020 04:29:02 +0100
Subject: [PATCH] Ignore paths that don't exist for dependencies

If a given path is not a valid dependency, just ignore it. This allows
falling back to git or the repository automatically while retaining the
ability to have the code locally if you need to develop a dependency in
tandem with the crate code.

Fixes #8747
---
 src/cargo/util/toml/mod.rs | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/cargo/util/toml/mod.rs b/src/cargo/util/toml/mod.rs
index 4bb1d7f4d2b..1941b6d4e7c 100644
--- a/src/cargo/util/toml/mod.rs
+++ b/src/cargo/util/toml/mod.rs
@@ -1642,9 +1642,23 @@ impl DetailedTomlDependency {
             }
         }
 
+        // Ignore paths that don't exist so as to fallback onto some other
+        // source in that circumstance. This allows specifying dependencies
+        // from crates.io or git as well as a local path for development and
+        // having everything just work.
+        let path = if let Some(path) = &self.path {
+            if Path::new(&path).join("Cargo.toml").exists() {
+                self.path.as_ref()
+            } else {
+                None
+            }
+        } else {
+            None
+        };
+
         let new_source_id = match (
             self.git.as_ref(),
-            self.path.as_ref(),
+            path,
             self.registry.as_ref(),
             self.registry_index.as_ref(),
         ) {