@@ -296,6 +296,12 @@ def outer_raise():
         self.assertTrue('inner_raise() # Marker' in blocks[2])
         self.check_zero_div(blocks[2])
 
+    def test_syntax_error_offset_at_eol(self):
+        # See #10186.
+        def e():
+            raise SyntaxError('', ('', 0, 5, 'hello'))
+        msg = self.get_report(e).splitlines()
+        self.assertEqual(msg[-2], "        ^")
 
 
 class PyExcReportingTests(BaseExceptionReportingTests, unittest.TestCase):
 
@@ -12,6 +12,9 @@ Core and Builtins
 
 - Issue #10077: Fix logging of site module errors at startup.
 
+- Issue #10186: Fix the SyntaxError caret when the offset is equal to the length
+  of the offending line.
+
 - Issue #9713, #10114: Parser functions (eg. PyParser_ASTFromFile) expects
   filenames encoded to the filesystem encoding with surrogateescape error
   handler (to support undecodable bytes), instead of UTF-8 in strict mode.
 
@@ -1299,8 +1299,6 @@ print_error_text(PyObject *f, int offset, const char *text)
 {
     char *nl;
     if (offset >= 0) {
-        if (offset > 0 && offset == (int)strlen(text))
-            offset--;
         for (;;) {
             nl = strchr(text, '\n');
             if (nl == NULL || nl-text >= offset)
Original file line number	Diff line number	Diff line change
`@@ -1299,8 +1299,6 @@ print_error_text(PyObject f, int offset, const char text)`
`1299`	`1299`	`{`
`1300`	`1300`	`char *nl;`
`1301`	`1301`	`if (offset >= 0) {`
`1302`		`- if (offset > 0 && offset == (int)strlen(text))`
`1303`		`- offset--;`
`1304`	`1302`	`for (;;) {`
`1305`	`1303`	`nl = strchr(text, '\n');`
`1306`	`1304`	`if (nl == NULL \|\| nl-text >= offset)`