Make autodiscovery disable inferred targets

src/cargo/util/toml/targets.rs

@@ -634,7 +634,12 @@ fn toml_targets_and_inferred(
 ) -> Vec<TomlTarget> {
     let inferred_targets = inferred_to_toml_targets(inferred);
     match toml_targets {
-        None => inferred_targets,
+        None =>
+            if let Some(false) = autodiscover {
+                vec![]
+            } else {
+                inferred_targets
+            },
         Some(targets) => {
             let mut targets = targets.clone();
 

tests/testsuite/run.rs

@@ -463,6 +463,28 @@ fn run_example_autodiscover_2018() {
         .run();
 }
 
+#[test]
+fn autobins_disables() {
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+            [project]
+            name = "foo"
+            version = "0.0.1"
+            autobins = false
+            "#
+        )
+        .file("src/lib.rs", "pub mod bin;")
+        .file("src/bin/mod.rs", "// empty")
+        .build();
+
+    p.cargo("run")
+        .with_status(101)
+        .with_stderr("[ERROR] a bin target must be available for `cargo run`")
+        .run();
+}
+
 #[test]
 fn run_bins() {
     let p = project()