Fix NamedExpr location

Author: harupy

parser/python.lalrpop

@@ -767,10 +767,10 @@ NamedExpressionTest: ast::Expr = {
 }
 
 NamedExpression: ast::Expr = {
-    <location:@L> <id:Identifier> ":=" <value:Test<"all">> <end_location:@R> => {
+    <location:@L> <id:Identifier> <end_location:@R> ":=" <value:Test<"all">> => {
         ast::Expr {
             location,
-            end_location: Some(end_location),
+            end_location: value.end_location,
             custom: (),
             node: ast::ExprKind::NamedExpr {
                 target: Box::new(ast::Expr::new(

parser/src/snapshots/rustpython_parser__context__tests__assign_named_expr.snap

@@ -37,7 +37,7 @@ expression: parse_ast
                         end_location: Some(
                             Location {
                                 row: 1,
-                                column: 8,
+                                column: 4,
                             },
                         ),
                         custom: (),

parser/src/snapshots/rustpython_parser__parser__tests__parse_named_expression_generator_comprehension.snap

@@ -36,7 +36,7 @@ Located {
                     end_location: Some(
                         Location {
                             row: 1,
-                            column: 11,
+                            column: 2,
                         },
                     ),
                     custom: (),

parser/src/snapshots/rustpython_parser__with__tests__with_statement.snap

@@ -1616,7 +1616,7 @@ expression: "parse_program(source, \"<test>\").unwrap()"
                                 end_location: Some(
                                     Location {
                                         row: 19,
-                                        column: 12,
+                                        column: 7,
                                     },
                                 ),
                                 custom: (),
@@ -1704,7 +1704,7 @@ expression: "parse_program(source, \"<test>\").unwrap()"
                                 end_location: Some(
                                     Location {
                                         row: 20,
-                                        column: 12,
+                                        column: 7,
                                     },
                                 ),
                                 custom: (),
@@ -1824,7 +1824,7 @@ expression: "parse_program(source, \"<test>\").unwrap()"
                                             end_location: Some(
                                                 Location {
                                                     row: 21,
-                                                    column: 12,
+                                                    column: 7,
                                                 },
                                             ),
                                             custom: (),
@@ -1875,7 +1875,7 @@ expression: "parse_program(source, \"<test>\").unwrap()"
                                             end_location: Some(
                                                 Location {
                                                     row: 21,
-                                                    column: 20,
+                                                    column: 15,
                                                 },
                                             ),
                                             custom: (),
@@ -1981,7 +1981,7 @@ expression: "parse_program(source, \"<test>\").unwrap()"
                                             end_location: Some(
                                                 Location {
                                                     row: 22,
-                                                    column: 12,
+                                                    column: 7,
                                                 },
                                             ),
                                             custom: (),
@@ -2032,7 +2032,7 @@ expression: "parse_program(source, \"<test>\").unwrap()"
                                             end_location: Some(
                                                 Location {
                                                     row: 22,
-                                                    column: 20,
+                                                    column: 15,
                                                 },
                                             ),
                                             custom: (),