From 0220c0b765e92dcb3565f0a8bd3c422afbd77f88 Mon Sep 17 00:00:00 2001
From: yukang <moorekang@gmail.com>
Date: Sun, 11 Jun 2023 14:36:20 +0800
Subject: [PATCH] Detect actual span for getting unexpected token from parsing
 macros

---
 compiler/rustc_parse/src/parser/expr.rs    | 10 ++++++++--
 tests/ui/parser/issues/issue-112458.rs     |  4 ++++
 tests/ui/parser/issues/issue-112458.stderr | 15 +++++++++++++++
 3 files changed, 27 insertions(+), 2 deletions(-)
 create mode 100644 tests/ui/parser/issues/issue-112458.rs
 create mode 100644 tests/ui/parser/issues/issue-112458.stderr

diff --git a/compiler/rustc_parse/src/parser/expr.rs b/compiler/rustc_parse/src/parser/expr.rs
index cea2a71c98821..d81b389920148 100644
--- a/compiler/rustc_parse/src/parser/expr.rs
+++ b/compiler/rustc_parse/src/parser/expr.rs
@@ -1013,9 +1013,15 @@ impl<'a> Parser<'a> {
     }
 
     fn error_unexpected_after_dot(&self) {
-        // FIXME Could factor this out into non_fatal_unexpected or something.
         let actual = pprust::token_to_string(&self.token);
-        self.sess.emit_err(errors::UnexpectedTokenAfterDot { span: self.token.span, actual });
+        let span = self.token.span;
+        let sm = self.sess.source_map();
+        let (span, actual) = match (&self.token.kind, self.subparser_name) {
+            (token::Eof, Some(_)) if let Ok(actual) = sm.span_to_snippet(sm.next_point(span)) =>
+                (span.shrink_to_hi(), actual.into()),
+            _ => (span, actual),
+        };
+        self.sess.emit_err(errors::UnexpectedTokenAfterDot { span, actual });
     }
 
     // We need an identifier or integer, but the next token is a float.
diff --git a/tests/ui/parser/issues/issue-112458.rs b/tests/ui/parser/issues/issue-112458.rs
new file mode 100644
index 0000000000000..36895450cd94f
--- /dev/null
+++ b/tests/ui/parser/issues/issue-112458.rs
@@ -0,0 +1,4 @@
+fn main() {
+    println!("{}", x.); //~ ERROR unexpected token: `)`
+    //~^ ERROR cannot find value `x` in this scope
+}
diff --git a/tests/ui/parser/issues/issue-112458.stderr b/tests/ui/parser/issues/issue-112458.stderr
new file mode 100644
index 0000000000000..54a8f1d03b02a
--- /dev/null
+++ b/tests/ui/parser/issues/issue-112458.stderr
@@ -0,0 +1,15 @@
+error: unexpected token: `)`
+  --> $DIR/issue-112458.rs:2:22
+   |
+LL |     println!("{}", x.);
+   |                      ^
+
+error[E0425]: cannot find value `x` in this scope
+  --> $DIR/issue-112458.rs:2:20
+   |
+LL |     println!("{}", x.);
+   |                    ^ not found in this scope
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0425`.