Auto merge of #7478 - DevinR528:preemtive, r=llogiq

Fix nonstandard_macro_braces FP and docs of disallowed_types

changelog: Fix FP in [`nonstandard_macro_braces`] lint

Author: bors

clippy_lints/src/nonstandard_macro_braces.rs

@@ -7,6 +7,7 @@ use clippy_utils::{diagnostics::span_lint_and_help, in_macro, is_direct_expn_of,
 use if_chain::if_chain;
 use rustc_ast::ast;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_hir::def_id::DefId;
 use rustc_lint::{EarlyContext, EarlyLintPass};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::Span;
@@ -91,13 +92,23 @@ impl EarlyLintPass for MacroBraces {
 }
 
 fn is_offending_macro<'a>(cx: &EarlyContext<'_>, span: Span, mac_braces: &'a MacroBraces) -> Option<MacroInfo<'a>> {
+    let unnested_or_local = || {
+        let nested = in_macro(span.ctxt().outer_expn_data().call_site);
+        !nested
+            || span
+                .macro_backtrace()
+                .last()
+                .map_or(false, |e| e.macro_def_id.map_or(false, DefId::is_local))
+    };
     if_chain! {
+        // Make sure we are only one level deep otherwise there are to many FP's
         if in_macro(span);
         if let Some((name, braces)) = find_matching_macro(span, &mac_braces.macro_braces);
         if let Some(snip) = snippet_opt(cx, span.ctxt().outer_expn_data().call_site);
         // we must check only invocation sites
         // https://github.com/rust-lang/rust-clippy/issues/7422
-        if snip.starts_with(name);
+        if snip.starts_with(&format!("{}!", name));
+        if unnested_or_local();
         // make formatting consistent
         let c = snip.replace(" ", "");
         if !c.starts_with(&format!("{}!{}", name, braces.0));

tests/ui-toml/nonstandard_macro_braces/conf_nonstandard_macro_braces.rs

@@ -32,13 +32,19 @@ macro_rules! type_pos {
     };
 }
 
+macro_rules! printlnfoo {
+    ($thing:expr) => {
+        println!("{}", $thing)
+    };
+}
+
 #[rustfmt::skip]
 fn main() {
     let _ = vec! {1, 2, 3};
     let _ = format!["ugh {} stop being such a good compiler", "hello"];
     let _ = quote!(let x = 1;);
     let _ = quote::quote!(match match match);
-    let _ = test!();
+    let _ = test!(); // trigger when macro def is inside our own crate
     let _ = vec![1,2,3];
 
     let _ = quote::quote! {true || false};
@@ -49,4 +55,6 @@ fn main() {
     let _: type_pos!(usize) = vec![];
 
     eprint!("test if user config overrides defaults");
+
+    printlnfoo!["test if printlnfoo is triggered by println"];
 }

tests/ui-toml/nonstandard_macro_braces/conf_nonstandard_macro_braces.stderr

@@ -1,48 +1,48 @@
 error: use of irregular braces for `vec!` macro
-  --> $DIR/conf_nonstandard_macro_braces.rs:37:13
+  --> $DIR/conf_nonstandard_macro_braces.rs:43:13
    |
 LL |     let _ = vec! {1, 2, 3};
    |             ^^^^^^^^^^^^^^
    |
    = note: `-D clippy::nonstandard-macro-braces` implied by `-D warnings`
 help: consider writing `vec![1, 2, 3]`
-  --> $DIR/conf_nonstandard_macro_braces.rs:37:13
+  --> $DIR/conf_nonstandard_macro_braces.rs:43:13
    |
 LL |     let _ = vec! {1, 2, 3};
    |             ^^^^^^^^^^^^^^
 
 error: use of irregular braces for `format!` macro
-  --> $DIR/conf_nonstandard_macro_braces.rs:38:13
+  --> $DIR/conf_nonstandard_macro_braces.rs:44:13
    |
 LL |     let _ = format!["ugh {} stop being such a good compiler", "hello"];
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
 help: consider writing `format!("ugh () stop being such a good compiler", "hello")`
-  --> $DIR/conf_nonstandard_macro_braces.rs:38:13
+  --> $DIR/conf_nonstandard_macro_braces.rs:44:13
    |
 LL |     let _ = format!["ugh {} stop being such a good compiler", "hello"];
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: use of irregular braces for `quote!` macro
-  --> $DIR/conf_nonstandard_macro_braces.rs:39:13
+  --> $DIR/conf_nonstandard_macro_braces.rs:45:13
    |
 LL |     let _ = quote!(let x = 1;);
    |             ^^^^^^^^^^^^^^^^^^
    |
 help: consider writing `quote! {let x = 1;}`
-  --> $DIR/conf_nonstandard_macro_braces.rs:39:13
+  --> $DIR/conf_nonstandard_macro_braces.rs:45:13
    |
 LL |     let _ = quote!(let x = 1;);
    |             ^^^^^^^^^^^^^^^^^^
 
 error: use of irregular braces for `quote::quote!` macro
-  --> $DIR/conf_nonstandard_macro_braces.rs:40:13
+  --> $DIR/conf_nonstandard_macro_braces.rs:46:13
    |
 LL |     let _ = quote::quote!(match match match);
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
 help: consider writing `quote::quote! {match match match}`
-  --> $DIR/conf_nonstandard_macro_braces.rs:40:13
+  --> $DIR/conf_nonstandard_macro_braces.rs:46:13
    |
 LL |     let _ = quote::quote!(match match match);
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -53,7 +53,7 @@ error: use of irregular braces for `vec!` macro
 LL |         vec!{0, 0, 0}
    |         ^^^^^^^^^^^^^
 ...
-LL |     let _ = test!();
+LL |     let _ = test!(); // trigger when macro def is inside our own crate
    |             ------- in this macro invocation
    |
 help: consider writing `vec![0, 0, 0]`
@@ -62,30 +62,30 @@ help: consider writing `vec![0, 0, 0]`
 LL |         vec!{0, 0, 0}
    |         ^^^^^^^^^^^^^
 ...
-LL |     let _ = test!();
+LL |     let _ = test!(); // trigger when macro def is inside our own crate
    |             ------- in this macro invocation
    = note: this error originates in the macro `test` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: use of irregular braces for `type_pos!` macro
-  --> $DIR/conf_nonstandard_macro_braces.rs:49:12
+  --> $DIR/conf_nonstandard_macro_braces.rs:55:12
    |
 LL |     let _: type_pos!(usize) = vec![];
    |            ^^^^^^^^^^^^^^^^
    |
 help: consider writing `type_pos![usize]`
-  --> $DIR/conf_nonstandard_macro_braces.rs:49:12
+  --> $DIR/conf_nonstandard_macro_braces.rs:55:12
    |
 LL |     let _: type_pos!(usize) = vec![];
    |            ^^^^^^^^^^^^^^^^
 
 error: use of irregular braces for `eprint!` macro
-  --> $DIR/conf_nonstandard_macro_braces.rs:51:5
+  --> $DIR/conf_nonstandard_macro_braces.rs:57:5
    |
 LL |     eprint!("test if user config overrides defaults");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
 help: consider writing `eprint!["test if user config overrides defaults"];`
-  --> $DIR/conf_nonstandard_macro_braces.rs:51:5
+  --> $DIR/conf_nonstandard_macro_braces.rs:57:5
    |
 LL |     eprint!("test if user config overrides defaults");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^