Stop test --doc from silently ignoring other target selecting options

src/bin/cargo/commands/test.rs

@@ -1,6 +1,6 @@
 use command_prelude::*;
 
-use cargo::ops;
+use cargo::ops::{self, CompileFilter};
 
 pub fn cli() -> App {
     subcommand("test")
@@ -92,8 +92,12 @@ pub fn exec(config: &mut Config, args: &ArgMatches) -> CliResult {
     let ws = args.workspace(config)?;
 
     let mut compile_opts = args.compile_options(config, CompileMode::Test)?;
+
     let doc = args.is_present("doc");
     if doc {
+        if let CompileFilter::Only { .. } = compile_opts.filter {
+            return Err(CliError::new(format_err!("Can't mix --doc with other target selecting options"), 101))
+        }
         compile_opts.build_config.mode = CompileMode::Doctest;
         compile_opts.filter = ops::CompileFilter::new(
             true,

tests/testsuite/test.rs

@@ -3101,3 +3101,70 @@ fn doctest_skip_staticlib() {
 [RUNNING] target/debug/deps/foo-[..]",
         ).run();
 }
+
+#[test]
+fn can_not_mix_doc_tests_and_regular_tests() {
+    let p = project()
+        .file("src/lib.rs", "\
+/// ```
+/// assert_eq!(1, 1)
+/// ```
+pub fn foo() -> u8 { 1 }
+
+#[cfg(test)] mod tests {
+    #[test] fn it_works() { assert_eq!(2 + 2, 4); }
+}
+")
+        .build();
+
+    p.cargo("test")
+        .with_stderr("\
+[COMPILING] foo v0.0.1 ([CWD])
+[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
+[RUNNING] target/debug/deps/foo-[..]
+[DOCTEST] foo
+")
+        .with_stdout("
+running 1 test
+test tests::it_works ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
+
+
+running 1 test
+test src/lib.rs - foo (line 1) ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
+\n")
+        .run();
+
+    p.cargo("test --lib")
+        .with_stderr("\
+[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
+[RUNNING] target/debug/deps/foo-[..]\n")
+        .with_stdout("
+running 1 test
+test tests::it_works ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
+\n")
+        .run();
+
+    p.cargo("test --doc")
+        .with_stderr("\
+[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
+[DOCTEST] foo
+")
+        .with_stdout("
+running 1 test
+test src/lib.rs - foo (line 1) ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
+
+").run();
+
+    p.cargo("test --lib --doc")
+        .with_status(101)
+        .with_stderr("[ERROR] Can't mix --doc with other target selecting options\n")
+        .run();
+}