Auto merge of #66180 - Centril:rollup-c1ji943, r=Centril

Rollup of 5 pull requests

Successful merges:

 - #59789 (Revert two unapproved changes to rustc_typeck.)
 - #65752 (Use structured suggestions for missing associated items)
 - #65884 (syntax: ABI-oblivious grammar)
 - #65974 (A scheme for more macro-matcher friendly pre-expansion gating)
 - #66017 (Add future incompatibility lint for `array.into_iter()`)

Failed merges:

 - #66056 (rustc_metadata: Some reorganization of the module structure)

r? @ghost

Author: bors

Diff for: Cargo.lock

@@ -3762,7 +3762,6 @@ dependencies = [
  "rustc",
  "rustc_codegen_utils",
  "rustc_data_structures",
- "rustc_target",
  "serde_json",
  "syntax",
  "syntax_pos",
@@ -4362,7 +4361,6 @@ dependencies = [
  "rustc_errors",
  "rustc_index",
  "rustc_lexer",
- "rustc_target",
  "scoped-tls",
  "serialize",
  "smallvec 1.0.0",
@@ -4380,7 +4378,6 @@ dependencies = [
  "rustc_errors",
  "rustc_index",
  "rustc_lexer",
- "rustc_target",
  "scoped-tls",
  "serialize",
  "smallvec 1.0.0",

Diff for: src/libcore/iter/traits/collect.rs

@@ -205,6 +205,7 @@ pub trait FromIterator<A>: Sized {
 ///         .collect()
 /// }
 /// ```
+#[rustc_diagnostic_item = "IntoIterator"]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub trait IntoIterator {
     /// The type of the elements being iterated over.