Add missing visit_pat_field in early lint visitor.

This ensures that lint attributes on pattern fields can control
early lints.

Author: ehuss

compiler/rustc_lint/src/early.rs

@@ -101,6 +101,12 @@ impl<'a, T: EarlyLintPass> ast_visit::Visitor<'a> for EarlyContextAndPass<'a, T>
         run_early_pass!(self, check_pat_post, p);
     }
 
+    fn visit_pat_field(&mut self, field: &'a ast::PatField) {
+        self.with_lint_attrs(field.id, &field.attrs, |cx| {
+            ast_visit::walk_pat_field(cx, field);
+        });
+    }
+
     fn visit_anon_const(&mut self, c: &'a ast::AnonConst) {
         self.check_id(c.id);
         ast_visit::walk_anon_const(self, c);

src/test/ui/lint/lint-attr-everywhere-early.rs

@@ -159,11 +159,18 @@ fn expressions() {
 
 // ################## Patterns
 fn patterns() {
-    // There aren't any early lints that I can find that apply to pattern fields.
-    //
-    // struct PatField{f1: i32, f2: i32};
-    // let f = PatField{f1: 1, f2: 2};
-    // let PatField{#[deny()]f1, #[deny()]..} = f;
+    struct PatField{f1: i32, f2: i32};
+    let f = PatField{f1: 1, f2: 2};
+    match f {
+        PatField {
+            #[deny(ellipsis_inclusive_range_patterns)]
+            f1: 0...100,
+            //~^ ERROR range patterns are deprecated
+            //~| WARNING this is accepted in the current edition
+            ..
+        } => {}
+        _ => {}
+    }
 }
 
 fn main() {}

src/test/ui/lint/lint-attr-everywhere-early.stderr

@@ -468,5 +468,19 @@ note: the lint level is defined here
 LL |     TupleStruct(#[deny(unsafe_code)] unsafe {123});
    |                        ^^^^^^^^^^^
 
-error: aborting due to 35 previous errors
+error: `...` range patterns are deprecated
+  --> $DIR/lint-attr-everywhere-early.rs:167:18
+   |
+LL |             f1: 0...100,
+   |                  ^^^ help: use `..=` for an inclusive range
+   |
+note: the lint level is defined here
+  --> $DIR/lint-attr-everywhere-early.rs:166:20
+   |
+LL |             #[deny(ellipsis_inclusive_range_patterns)]
+   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
+
+error: aborting due to 36 previous errors