Fix bad formatting of error messages about EOF in multi-line statements

CHANGES.md

@@ -44,6 +44,7 @@
 - Fix regression where `R` prefixes would be lowercased for docstrings (#2285)
 - Fix handling of named escapes (`\N{...}`) when `--experimental-string-processing` is
   used (#2319)
+- Fix bad formatting of error messages about EOF in multi-line statements (#2343)
 
 ### Integrations
 

src/black/parsing.py

@@ -11,6 +11,7 @@
 from blib2to3.pgen2 import driver
 from blib2to3.pgen2.grammar import Grammar
 from blib2to3.pgen2.parse import ParseError
+from blib2to3.pgen2.tokenize import TokenError
 
 from black.mode import TargetVersion, Feature, supports_feature
 from black.nodes import syms
@@ -92,6 +93,12 @@ def lib2to3_parse(src_txt: str, target_versions: Iterable[TargetVersion] = ()) -
             except IndexError:
                 faulty_line = "<line number missing in source>"
             exc = InvalidInput(f"Cannot parse: {lineno}:{column}: {faulty_line}")
+
+        except TokenError as te:
+            lineno, column = te.args[1]
+            lines = src_txt.splitlines()
+            exc = InvalidInput(f"Cannot parse: {lineno}:{column}: Unexpected EOF")
+
     else:
         raise exc from None