Auto merge of #51521 - Mark-Simulacrum:rollup, r=Mark-Simulacrum

Rollup of 3 pull requests

Successful merges:

 - #51261 (Updated RELEASES.md for 1.27.0)
 - #51502 (Make parse_seq_to_end and parse_path public)
 - #51510 (Long diagnostic for E0538)

Failed merges:

2 files changed, 32 insertions, 3 deletions

diff --git a/src/libsyntax/diagnostic_list.rs b/src/libsyntax/diagnostic_list.rs
index 9775a6475cc..ab8317bfa02 100644
--- a/src/libsyntax/diagnostic_list.rs
+++ b/src/libsyntax/diagnostic_list.rs
@@ -93,6 +93,36 @@ For more information about the cfg attribute, read:
 https://doc.rust-lang.org/reference.html#conditional-compilation
 "##,
 
+E0538: r##"
+Attribute contains same meta item more than once.
+
+Erroneous code example:
+
+```compile_fail,E0538
+#[deprecated(
+    since="1.0.0",
+    note="First deprecation note.",
+    note="Second deprecation note." // error: multiple same meta item
+)]
+fn deprecated_function() {}
+```
+
+Meta items are the key-value pairs inside of an attribute. Each key may only be
+used once in each attribute.
+
+To fix the problem, remove all but one of the meta items with the same key.
+
+Example:
+
+```
+#[deprecated(
+    since="1.0.0",
+    note="First deprecation note."
+)]
+fn deprecated_function() {}
+```
+"##,
+
 E0541: r##"
 An unknown meta item was used.
 
@@ -347,7 +377,6 @@ and likely to change in the future.
 }
 
 register_diagnostics! {
-    E0538, // multiple [same] items
     E0539, // incorrect meta item
     E0540, // multiple rustc_deprecated attributes
     E0542, // missing 'since'
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 092564d158f..e1f920c16fd 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -1022,7 +1022,7 @@ impl<'a> Parser<'a> {
     /// Parse a sequence, including the closing delimiter. The function
     /// f must consume tokens until reaching the next separator or
     /// closing bracket.
-    crate fn parse_seq_to_end<T, F>(&mut self,
+    pub fn parse_seq_to_end<T, F>(&mut self,
                                   ket: &token::Token,
                                   sep: SeqSep,
                                   f: F)
@@ -1886,7 +1886,7 @@ impl<'a> Parser<'a> {
     /// `a::b::C::<D>` (with disambiguator)
     /// `Fn(Args)` (without disambiguator)
     /// `Fn::(Args)` (with disambiguator)
-    crate fn parse_path(&mut self, style: PathStyle) -> PResult<'a, ast::Path> {
+    pub fn parse_path(&mut self, style: PathStyle) -> PResult<'a, ast::Path> {
         self.parse_path_common(style, true)
     }