From d3d1c8587ab5e36d1643c1480f1644b38dddd83d Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Sun, 27 Mar 2022 13:17:22 -0700
Subject: [PATCH 1/2] Parse unicode character literals

---
 src/lib.rs         | 10 ++++++++++
 tests/test_expr.rs |  3 +++
 2 files changed, 13 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index e693cb2..a6213a4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -364,6 +364,16 @@ fn parse_bracket_as_segments(input: TokenStream, scope: Span) -> Result<Vec<Segm
 
     for segment in &mut segments {
         if let Segment::String(string) = segment {
+            if string.value.starts_with("'\\u{") {
+                let hex = &string.value[4..string.value.len() - 2];
+                if let Ok(unsigned) = u32::from_str_radix(hex, 16) {
+                    if let Some(ch) = char::from_u32(unsigned) {
+                        string.value.clear();
+                        string.value.push(ch);
+                        continue;
+                    }
+                }
+            }
             if string.value.contains(&['#', '\\', '.', '+'][..])
                 || string.value.starts_with("b'")
                 || string.value.starts_with("b\"")
diff --git a/tests/test_expr.rs b/tests/test_expr.rs
index 13a0276..3d3b977 100644
--- a/tests/test_expr.rs
+++ b/tests/test_expr.rs
@@ -40,6 +40,9 @@ fn test_literals() {
 
     let pasted = paste!([<CONST r"0">]);
     assert_eq!(pasted, CONST0);
+
+    let pasted = paste!([<CONST '\u{30}'>]);
+    assert_eq!(pasted, CONST0);
 }
 
 #[test]

From dbf1be17cfbf61618ef07550a1e13d637db84c94 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Sun, 27 Mar 2022 13:20:54 -0700
Subject: [PATCH 2/2] Restore compatibility with rustc older than 1.52

---
 src/lib.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/lib.rs b/src/lib.rs
index a6213a4..8f7e95f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -155,6 +155,7 @@ use crate::attr::expand_attr;
 use crate::error::{Error, Result};
 use crate::segment::Segment;
 use proc_macro::{Delimiter, Group, Ident, Punct, Spacing, Span, TokenStream, TokenTree};
+use std::char;
 use std::iter;
 use std::panic;