stop linting [blocks_in_conditions] on match on proc macros

Author: J-ZhengLi

clippy_lints/src/blocks_in_conditions.rs

@@ -2,7 +2,7 @@ use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg};
 use clippy_utils::source::snippet_block_with_applicability;
 use clippy_utils::ty::implements_trait;
 use clippy_utils::visitors::{for_each_expr, Descend};
-use clippy_utils::{get_parent_expr, higher};
+use clippy_utils::{get_parent_expr, higher, is_from_proc_macro};
 use core::ops::ControlFlow;
 use rustc_errors::Applicability;
 use rustc_hir::{BlockCheckMode, Expr, ExprKind, MatchSource};
@@ -94,7 +94,7 @@ impl<'tcx> LateLintPass<'tcx> for BlocksInConditions {
                     }
                 } else {
                     let span = block.expr.as_ref().map_or_else(|| block.stmts[0].span, |e| e.span);
-                    if span.from_expansion() || expr.span.from_expansion() {
+                    if span.from_expansion() || expr.span.from_expansion() || is_from_proc_macro(cx, cond) {
                         return;
                     }
                     // move block higher

tests/ui/blocks_in_conditions.fixed

@@ -104,7 +104,7 @@ fn issue_12162() {
 mod issue_12016 {
     #[proc_macro_attr::fake_desugar_await]
     pub async fn await_becomes_block() -> i32 {
-        let res = await; match res {
+        match Some(1).await {
             Some(1) => 2,
             Some(2) => 3,
             _ => 0,

tests/ui/blocks_in_conditions.stderr

@@ -53,11 +53,5 @@ LL +         opt
 LL ~     }; match res {
    |
 
-error: in a `match` scrutinee, avoid complex blocks or closures with blocks; instead, move the block or closure higher and bind it with a `let`
-  --> $DIR/blocks_in_conditions.rs:107:9
-   |
-LL |         match Some(1).await {
-   |         ^^^^^^^^^^^^^^^^^^^ help: try: `let res = await; match res`
-
-error: aborting due to 5 previous errors
+error: aborting due to 4 previous errors