Fix dashes in rename dependencies.

Author: ehuss

src/cargo/core/resolver/resolve.rs

@@ -224,10 +224,10 @@ unable to verify that `{0}` is the same as when the lockfile was generated
         let crate_name = to_target.crate_name();
         let mut names = deps.iter().map(|d| {
             d.explicit_name_in_toml()
-                .map(|s| s.as_str())
-                .unwrap_or(&crate_name)
+                .map(|s| s.as_str().replace("-", "_"))
+                .unwrap_or(crate_name.clone())
         });
-        let name = names.next().unwrap_or(&crate_name);
+        let name = names.next().unwrap_or(crate_name.clone());
         for n in names {
             if n == name {
                 continue;

tests/testsuite/rename_deps.rs

@@ -433,3 +433,28 @@ Caused by:
 ",
         ).run();
 }
+
+#[test]
+fn rename_with_dash() {
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                cargo-features = ["rename-dependency"]
+                [package]
+                name = "qwerty"
+                version = "0.1.0"
+
+                [dependencies]
+                foo-bar = { path = 'a', package = 'a' }
+            "#,
+        )
+        .file("src/lib.rs", "extern crate foo_bar;")
+        .file("a/Cargo.toml", &basic_manifest("a", "0.1.0"))
+        .file("a/src/lib.rs", "")
+        .build();
+
+    p.cargo("build")
+        .masquerade_as_nightly_cargo()
+        .run();
+}