transpile, analyze: remove #![feature(label_break_value)], stabilized in Rust 1.65 (our current nightly) (#1431)

* Fixes #731.

Author: kkysen

c2rust-analyze/tests/filecheck/alloc.rs

@@ -1,5 +1,4 @@
 #![feature(extern_types)]
-#![feature(label_break_value)]
 #![feature(rustc_private)]
 #![feature(c_variadic)]
 #![allow(non_upper_case_globals)]

c2rust-transpile/src/cfg/mod.rs

@@ -2130,7 +2130,6 @@ impl CfgBuilder {
             || !IncCleanup::new(in_tail, brk_lbl.clone()).remove_tail_expr(&mut stmts);
 
         if has_fallthrough && need_block && use_brk_lbl {
-            translator.use_feature("label_break_value");
             let block_body = mk().block(stmts);
             let block: Box<Expr> = mk().labelled_block_expr(block_body, brk_lbl.pretty_print());
             stmts = vec![mk().expr_stmt(block)]

c2rust-transpile/src/translator/mod.rs

@@ -4335,10 +4335,7 @@ impl<'c> Translation<'c> {
 
                             return Ok(WithStmts::new(stmts, val));
                         }
-                        _ => {
-                            self.use_feature("label_break_value");
-                            stmts.push(stmt)
-                        }
+                        _ => stmts.push(stmt),
                     }
                 }
 

tests/gotos/src/test_translation_only.rs

@@ -1,5 +1,3 @@
-//! feature_label_break_value
-
 use crate::jump_into_loop::rust_jump_into_loop;
 use crate::label_break_trigger::rust_triggers_label_break;
 

tests/misc/src/test_sizeofs.rs

@@ -1,4 +1,4 @@
-//! feature_core_intrinsics, feature_label_break_value
+//! feature_core_intrinsics
 
 use crate::sizeofs::rust_sizeofs;
 use std::ffi::{c_int, c_uint};