Remove continuations before trailing semicolons (#5199)

## Summary

Closes #4828.

crates/ruff/resources/test/fixtures/pycodestyle/E70.py

@@ -63,3 +63,6 @@ class Foo:
 #: E702:2:4
 while 1:
   1;...
+#: E703:2:1
+0\
+;

crates/ruff/src/checkers/tokens.rs

@@ -141,7 +141,7 @@ pub(crate) fn check_tokens(
     // E701, E702, E703
     if enforce_compound_statements {
         diagnostics.extend(
-            pycodestyle::rules::compound_statements(tokens, settings)
+            pycodestyle::rules::compound_statements(tokens, indexer, locator, settings)
                 .into_iter()
                 .filter(|diagnostic| settings.rules.enabled(diagnostic.kind.rule())),
         );

crates/ruff/src/rules/pycodestyle/rules/compound_statements.rs

@@ -5,6 +5,8 @@ use rustpython_parser::Tok;
 use ruff_diagnostics::{AlwaysAutofixableViolation, Violation};
 use ruff_diagnostics::{Diagnostic, Edit, Fix};
 use ruff_macros::{derive_message_formats, violation};
+use ruff_python_ast::helpers;
+use ruff_python_ast::source_code::{Indexer, Locator};
 
 use crate::registry::Rule;
 use crate::settings::Settings;
@@ -97,7 +99,12 @@ impl AlwaysAutofixableViolation for UselessSemicolon {
 }
 
 /// E701, E702, E703
-pub(crate) fn compound_statements(lxr: &[LexResult], settings: &Settings) -> Vec<Diagnostic> {
+pub(crate) fn compound_statements(
+    lxr: &[LexResult],
+    indexer: &Indexer,
+    locator: &Locator,
+    settings: &Settings,
+) -> Vec<Diagnostic> {
     let mut diagnostics = vec![];
 
     // Track the last seen instance of a variety of tokens.
@@ -164,8 +171,11 @@ pub(crate) fn compound_statements(lxr: &[LexResult], settings: &Settings) -> Vec
                     let mut diagnostic =
                         Diagnostic::new(UselessSemicolon, TextRange::new(start, end));
                     if settings.rules.should_fix(Rule::UselessSemicolon) {
-                        #[allow(deprecated)]
-                        diagnostic.set_fix(Fix::unspecified(Edit::deletion(start, end)));
+                        diagnostic.set_fix(Fix::automatic(Edit::deletion(
+                            helpers::preceded_by_continuations(start, locator, indexer)
+                                .unwrap_or(start),
+                            end,
+                        )));
                     };
                     diagnostics.push(diagnostic);
                 }

crates/ruff/src/rules/pycodestyle/snapshots/ruff__rules__pycodestyle__tests__E702_E70.py.snap

@@ -67,6 +67,8 @@ E70.py:65:4: E702 Multiple statements on one line (semicolon)
 64 | while 1:
 65 |   1;...
    |    ^ E702
+66 | #: E703:2:1
+67 | 0\
    |
 
 

crates/ruff/src/rules/pycodestyle/snapshots/ruff__rules__pycodestyle__tests__E703_E70.py.snap

@@ -12,7 +12,7 @@ E70.py:10:13: E703 [*] Statement ends with an unnecessary semicolon
    |
    = help: Remove unnecessary semicolon
 
-ℹ Suggested fix
+ℹ Fix
 7  7  | #: E702:1:17
 8  8  | import bdist_egg; bdist_egg.write_safety_flag(cmd.egg_info, safe)
 9  9  | #: E703:1:13
@@ -33,7 +33,7 @@ E70.py:12:23: E703 [*] Statement ends with an unnecessary semicolon
    |
    = help: Remove unnecessary semicolon
 
-ℹ Suggested fix
+ℹ Fix
 9  9  | #: E703:1:13
 10 10 | import shlex;
 11 11 | #: E702:1:9 E703:1:23
@@ -54,7 +54,7 @@ E70.py:25:14: E703 [*] Statement ends with an unnecessary semicolon
    |
    = help: Remove unnecessary semicolon
 
-ℹ Suggested fix
+ℹ Fix
 22 22 | while all is round:
 23 23 |     def f(x): return 2*x
 24 24 | #: E704:1:8 E702:1:11 E703:1:14
@@ -64,4 +64,21 @@ E70.py:25:14: E703 [*] Statement ends with an unnecessary semicolon
 27 27 | if True: lambda a: b
 28 28 | #: E701:1:10
 
+E70.py:68:1: E703 [*] Statement ends with an unnecessary semicolon
+   |
+66 | #: E703:2:1
+67 | 0\
+68 | ;
+   | ^ E703
+   |
+   = help: Remove unnecessary semicolon
+
+ℹ Fix
+64 64 | while 1:
+65 65 |   1;...
+66 66 | #: E703:2:1
+67    |-0\
+68    |-;
+   67 |+0
+