Auto merge of rust-lang#7029 - ABouttefeux:master, r=Manishearth

fix `missing_panics_doc` not detecting `assert_eq!` and `assert_ne!`

fixes rust-lang#6997
changelog: `missing_panics_doc` detects `assert_eq!` and `assert_ne!`

---
searching for `assert_eq!` and `assert_ne!` in `FindPanicUnwrap`

clippy_lints/src/doc.rs

@@ -721,6 +721,11 @@ impl<'a, 'tcx> Visitor<'tcx> for FindPanicUnwrap<'a, 'tcx> {
             }
         }
 
+        // check for `assert_eq` or `assert_ne`
+        if is_expn_of(expr.span, "assert_eq").is_some() || is_expn_of(expr.span, "assert_ne").is_some() {
+            self.panic_span = Some(expr.span);
+        }
+
         // check for `unwrap`
         if let Some(arglists) = method_chain_args(expr, &["unwrap"]) {
             let reciever_ty = self.typeck_results.expr_ty(&arglists[0][0]).peel_refs();

tests/ui/missing_panics_doc.rs

@@ -33,6 +33,18 @@ pub fn unreachable_and_panic() {
     if true { unreachable!() } else { panic!() }
 }
 
+/// This needs to be documented
+pub fn assert_eq() {
+    let x = 0;
+    assert_eq!(x, 0);
+}
+
+/// This needs to be documented
+pub fn assert_ne() {
+    let x = 0;
+    assert_ne!(x, 0);
+}
+
 /// This is documented
 ///
 /// # Panics
@@ -83,6 +95,26 @@ pub fn unreachable_amd_panic_documented() {
     if true { unreachable!() } else { panic!() }
 }
 
+/// This is documented
+///
+/// # Panics
+///
+/// Panics if `x` is not 0.
+pub fn assert_eq_documented() {
+    let x = 0;
+    assert_eq!(x, 0);
+}
+
+/// This is documented
+///
+/// # Panics
+///
+/// Panics if `x` is 0.
+pub fn assert_ne_documented() {
+    let x = 0;
+    assert_ne!(x, 0);
+}
+
 /// This is okay because it is private
 fn unwrap_private() {
     let result = Err("Hi");

tests/ui/missing_panics_doc.stderr

@@ -78,5 +78,37 @@ LL |     if true { unreachable!() } else { panic!() }
    |                                       ^^^^^^^^
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: aborting due to 5 previous errors
+error: docs for function which may panic missing `# Panics` section
+  --> $DIR/missing_panics_doc.rs:37:1
+   |
+LL | / pub fn assert_eq() {
+LL | |     let x = 0;
+LL | |     assert_eq!(x, 0);
+LL | | }
+   | |_^
+   |
+note: first possible panic found here
+  --> $DIR/missing_panics_doc.rs:39:5
+   |
+LL |     assert_eq!(x, 0);
+   |     ^^^^^^^^^^^^^^^^^
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: docs for function which may panic missing `# Panics` section
+  --> $DIR/missing_panics_doc.rs:43:1
+   |
+LL | / pub fn assert_ne() {
+LL | |     let x = 0;
+LL | |     assert_ne!(x, 0);
+LL | | }
+   | |_^
+   |
+note: first possible panic found here
+  --> $DIR/missing_panics_doc.rs:45:5
+   |
+LL |     assert_ne!(x, 0);
+   |     ^^^^^^^^^^^^^^^^^
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to 7 previous errors