enable cargo edition feature & bump to 2018

diff --git a/tests/testsuite/install.rs b/tests/testsuite/install.rs
index 0429540e783d372cde7c33b50795b44398579cc5..3224f269f3253ec8baec49a01850d2bdbb65f531 100644 (file)
--- a/tests/testsuite/install.rs
+++ b/tests/testsuite/install.rs
@@ -1025,10 +1025,13 @@ fn installs_from_cwd_with_2018_warnings() {
         .file(
             "Cargo.toml",
             r#"
+            cargo-features = ["edition"]
+
             [package]
             name = "foo"
             version = "0.1.0"
             authors = []
+            rust = "2018"
         "#,
         )
         .file("src/main.rs", "fn main() {}")