Remove do { ... } while ... from the language.

Author: paulstansifer

src/fuzzer/fuzzer.rs

@@ -74,9 +74,6 @@ pure fn safe_to_use_expr(e: ast::expr, tm: test_mode) -> bool {
           ast::expr_alt(_, _, _) { false }
           ast::expr_while(_, _) { false }
 
-          // https://github.com/mozilla/rust/issues/955
-          ast::expr_do_while(_, _) { false }
-
           // https://github.com/mozilla/rust/issues/929
           ast::expr_cast(_, _) { false }
           ast::expr_assert(_) { false }

src/librustsyntax/ast.rs

@@ -305,7 +305,6 @@ enum expr_ {
     expr_cast(@expr, @ty),
     expr_if(@expr, blk, option<@expr>),
     expr_while(@expr, blk),
-    expr_do_while(blk, @expr),
     /* Conditionless loop (can be exited with break, cont, ret, or fail)
        Same semantics as while(true) { body }, but typestate knows that the
        (implicit) condition is always true. */

src/librustsyntax/fold.rs

@@ -444,9 +444,6 @@ fn noop_fold_expr(e: expr_, fld: ast_fold) -> expr_ {
           expr_while(cond, body) {
             expr_while(fld.fold_expr(cond), fld.fold_block(body))
           }
-          expr_do_while(blk, expr) {
-            expr_do_while(fld.fold_block(blk), fld.fold_expr(expr))
-          }
           expr_loop(body) {
               expr_loop(fld.fold_block(body))
           }

src/librustsyntax/parse/classify.rs

@@ -7,8 +7,8 @@ fn expr_requires_semi_to_be_stmt(e: @ast::expr) -> bool {
     alt e.node {
       ast::expr_if(_, _, _) | ast::expr_if_check(_, _, _)
       | ast::expr_alt(_, _, _) | ast::expr_block(_)
-      | ast::expr_do_while(_, _) | ast::expr_while(_, _)
-      | ast::expr_loop(_) | ast::expr_call(_, _, true) {
+      | ast::expr_while(_, _) | ast::expr_loop(_)
+      | ast::expr_call(_, _, true) {
         false
       }
       _ { true }

src/librustsyntax/parse/parser.rs

@@ -727,8 +727,6 @@ fn parse_bottom_expr(p: parser) -> pexpr {
         ret pexpr(parse_for_expr(p));
     } else if eat_keyword(p, "while") {
         ret pexpr(parse_while_expr(p));
-    } else if eat_keyword(p, "do") {
-        ret pexpr(parse_do_while_expr(p));
     } else if eat_keyword(p, "loop") {
         ret pexpr(parse_loop_expr(p));
     } else if eat_keyword(p, "alt") {
@@ -1233,15 +1231,6 @@ fn parse_while_expr(p: parser) -> @expr {
     ret mk_expr(p, lo, hi, expr_while(cond, body));
 }
 
-fn parse_do_while_expr(p: parser) -> @expr {
-    let lo = p.last_span.lo;
-    let body = parse_block_no_value(p);
-    expect_keyword(p, "while");
-    let cond = parse_expr(p);
-    let mut hi = cond.span.hi;
-    ret mk_expr(p, lo, hi, expr_do_while(body, cond));
-}
-
 fn parse_loop_expr(p: parser) -> @expr {
     let lo = p.last_span.lo;
     let body = parse_block_no_value(p);

src/librustsyntax/print/pprust.rs

@@ -975,14 +975,6 @@ fn print_expr(s: ps, &&expr: @ast::expr) {
         space(s.s);
         print_block(s, blk);
       }
-      ast::expr_do_while(blk, expr) {
-        head(s, "do");
-        space(s.s);
-        print_block(s, blk);
-        space(s.s);
-        word_space(s, "while");
-        print_expr(s, expr);
-      }
       ast::expr_alt(expr, arms, mode) {
         cbox(s, alt_indent_unit);
         ibox(s, 4u);

src/librustsyntax/visit.rs

@@ -376,7 +376,6 @@ fn visit_expr<E>(ex: @expr, e: E, v: vt<E>) {
       }
       expr_while(x, b) { v.visit_expr(x, e, v); v.visit_block(b, e, v); }
       expr_loop(b) { v.visit_block(b, e, v); }
-      expr_do_while(b, x) { v.visit_block(b, e, v); v.visit_expr(x, e, v); }
       expr_alt(x, arms, _) {
         v.visit_expr(x, e, v);
         for arms.each {|a| v.visit_arm(a, e, v); }

src/rustc/middle/alias.rs

@@ -122,7 +122,7 @@ fn visit_expr(cx: @ctx, ex: @ast::expr, sc: scope, v: vt<scope>) {
         check_lval(cx, dest, sc, v);
       }
       ast::expr_if(c, then, els) { check_if(c, then, els, sc, v); }
-      ast::expr_while(_, _) | ast::expr_do_while(_, _) {
+      ast::expr_while(_, _) {
         check_loop(*cx, sc) {|| visit::visit_expr(ex, sc, v); }
       }
       _ { handled = false; }

src/rustc/middle/borrowck.rs

@@ -761,9 +761,9 @@ impl categorize_methods for borrowck_ctxt {
           ast::expr_vstore(*) | ast::expr_vec(*) | ast::expr_tup(*) |
           ast::expr_if_check(*) | ast::expr_if(*) | ast::expr_log(*) |
           ast::expr_new(*) | ast::expr_binary(*) | ast::expr_while(*) |
-          ast::expr_do_while(*) | ast::expr_block(*) | ast::expr_loop(*) |
-          ast::expr_alt(*) | ast::expr_lit(*) | ast::expr_break |
-          ast::expr_mac(*) | ast::expr_cont | ast::expr_rec(*) {
+          ast::expr_block(*) | ast::expr_loop(*) | ast::expr_alt(*) |
+          ast::expr_lit(*) | ast::expr_break | ast::expr_mac(*) |
+          ast::expr_cont | ast::expr_rec(*) {
             @{id:expr.id, span:expr.span,
               cat:cat_rvalue(rv_misc), lp:none,
               mutbl:m_imm, ty:expr_ty}

src/rustc/middle/check_loop.rs

@@ -11,7 +11,7 @@ fn check_crate(tcx: ty::ctxt, crate: @crate) {
         },
         visit_expr: {|e: @expr, cx: ctx, v: visit::vt<ctx>|
             alt e.node {
-              expr_while(e, b) | expr_do_while(b, e) {
+              expr_while(e, b) {
                 v.visit_expr(e, cx, v);
                 v.visit_block(b, {in_loop: true with cx}, v);
               }