From 02bb1c8c973689a9ee3ac89a2d41b9b1576bb2db Mon Sep 17 00:00:00 2001
From: Seiichi Uchida <seuchida@gmail.com>
Date: Sat, 23 Dec 2017 11:58:19 +0900
Subject: [PATCH 1/5] Rustup to rustc 1.24.0-nightly (5165ee9e2 2017-12-22)

---
 src/closures.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/closures.rs b/src/closures.rs
index cfc75664f301..f63242f63554 100644
--- a/src/closures.rs
+++ b/src/closures.rs
@@ -135,6 +135,7 @@ fn rewrite_closure_with_block(
         id: ast::NodeId::new(0),
         rules: ast::BlockCheckMode::Default,
         span: body.span,
+        recovered: false,
     };
     let block = ::expr::rewrite_block_with_visitor(context, "", &block, shape, false)?;
     Some(format!("{} {}", prefix, block))

From 0ef2b99b745cd85c10a1a5d8d4e048a9a00a1e08 Mon Sep 17 00:00:00 2001
From: Seiichi Uchida <seuchida@gmail.com>
Date: Sat, 23 Dec 2017 12:24:58 +0900
Subject: [PATCH 2/5] Remove workspace membership check

---
 src/bin/cargo-fmt.rs | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

diff --git a/src/bin/cargo-fmt.rs b/src/bin/cargo-fmt.rs
index dda99b43d4b8..270ed1446d6b 100644
--- a/src/bin/cargo-fmt.rs
+++ b/src/bin/cargo-fmt.rs
@@ -252,24 +252,13 @@ fn get_targets_root_only(targets: &mut HashSet<Target>) -> Result<(), io::Error>
 
     for package in metadata.packages {
         for target in package.targets {
-            if is_target_workspace_members(&target.name, &metadata.workspace_members) {
-                targets.insert(Target::from_target(&target));
-            }
+            targets.insert(Target::from_target(&target));
         }
     }
 
     Ok(())
 }
 
-fn is_target_workspace_members(target: &str, workspace_members: &[String]) -> bool {
-    workspace_members.iter().any(|member| {
-        member
-            .split_whitespace()
-            .nth(0)
-            .map_or(false, |name| name == target)
-    })
-}
-
 fn get_targets_recursive(
     manifest_path: Option<&Path>,
     mut targets: &mut HashSet<Target>,

From 6714a447d063b079de8fb2884ded2c8c3e96bc1d Mon Sep 17 00:00:00 2001
From: Seiichi Uchida <seuchida@gmail.com>
Date: Sat, 23 Dec 2017 12:25:42 +0900
Subject: [PATCH 3/5] 0.3.4

---
 CHANGELOG.md | 10 ++++++++++
 Cargo.lock   |  8 ++++----
 Cargo.toml   |  4 ++--
 3 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3113a0a594e9..86fbafbef8c9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,16 @@
 
 ## [Unreleased]
 
+## [0.3.4] 2017-12-23
+
+### Added
+
+- Add `--version` flag to `cargo-fmt`, allow `carfo fmt --version`.
+
+### Fixed
+
+- Rustup to `rustc 1.24.0-nightly (5165ee9e2 2017-12-22)`.
+
 ## [0.3.3] 2017-12-22
 
 ### Added
diff --git a/Cargo.lock b/Cargo.lock
index 5fdaa40f52ce..87d2529fe24c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -31,7 +31,7 @@ dependencies = [
 
 [[package]]
 name = "cargo_metadata"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -172,9 +172,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "rustfmt-nightly"
-version = "0.3.3"
+version = "0.3.4"
 dependencies = [
- "cargo_metadata 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cargo_metadata 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "derive-new 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "diff 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -327,7 +327,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum aho-corasick 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)" = "d6531d44de723825aa81398a6415283229725a00fa30713812ab9323faa82fc4"
 "checksum backtrace 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "8709cc7ec06f6f0ae6c2c7e12f6ed41540781f72b488d83734978295ceae182e"
 "checksum backtrace-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "44585761d6161b0f57afc49482ab6bd067e4edef48c12a152c237eb0203f7661"
-"checksum cargo_metadata 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "1f56ec3e469bca7c276f2eea015aa05c5e381356febdbb0683c2580189604537"
+"checksum cargo_metadata 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "20d6fb2b5574726329c85cdba0df0347fddfec3cf9c8b588f9931708280f5643"
 "checksum cc 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a9b13a57efd6b30ecd6598ebdb302cca617930b5470647570468a65d12ef9719"
 "checksum cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d4c819a1287eb618df47cc647173c5c4c66ba19d888a6e50d605672aed3140de"
 "checksum dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "97590ba53bcb8ac28279161ca943a924d1fd4a8fb3fa63302591647c4fc5b850"
diff --git a/Cargo.toml b/Cargo.toml
index 74e83414b3da..a0f974c66144 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 
 name = "rustfmt-nightly"
-version = "0.3.3"
+version = "0.3.4"
 authors = ["Nicholas Cameron <ncameron@mozilla.com>", "The Rustfmt developers"]
 description = "Tool to find and fix Rust formatting issues"
 repository = "https://github.com/rust-lang-nursery/rustfmt"
@@ -43,7 +43,7 @@ log = "0.3"
 env_logger = "0.4"
 getopts = "0.2"
 derive-new = "0.5"
-cargo_metadata = "0.3"
+cargo_metadata = "0.4"
 
 [target.'cfg(unix)'.dependencies]
 libc = "0.2.11"

From 1ef6bccea37839b3d33cbadc15e5e243b6371ea5 Mon Sep 17 00:00:00 2001
From: Seiichi Uchida <seuchida@gmail.com>
Date: Sun, 24 Dec 2017 00:28:58 +0900
Subject: [PATCH 4/5] Cargo fmt

Run 'cargo fmt' with the following setting:

```
reorder_imports = true
reorder_imports_in_group = true
```
---
 src/chains.rs   | 2 +-
 src/config.rs   | 2 +-
 src/expr.rs     | 4 ++--
 src/filemap.rs  | 8 ++++----
 src/imports.rs  | 2 +-
 src/items.rs    | 2 +-
 src/modules.rs  | 2 +-
 src/patterns.rs | 2 +-
 src/types.rs    | 2 +-
 src/vertical.rs | 2 +-
 src/visitor.rs  | 4 ++--
 11 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/src/chains.rs b/src/chains.rs
index f63ddd44c1da..383e7077d660 100644
--- a/src/chains.rs
+++ b/src/chains.rs
@@ -59,11 +59,11 @@
 //!            .qux
 //! ```
 
-use shape::Shape;
 use config::IndentStyle;
 use expr::rewrite_call;
 use macros::convert_try_mac;
 use rewrite::{Rewrite, RewriteContext};
+use shape::Shape;
 use utils::{first_line_width, last_line_extendable, last_line_width, mk_sp,
             trimmed_last_line_width, wrap_str};
 
diff --git a/src/config.rs b/src/config.rs
index 67ca3f6c3ad2..bdf39ed6a2c0 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -17,9 +17,9 @@ use std::fs::File;
 use std::io::{Error, ErrorKind, Read};
 use std::path::{Path, PathBuf};
 
+use Summary;
 use file_lines::FileLines;
 use lists::{ListTactic, SeparatorPlace, SeparatorTactic};
-use Summary;
 
 /// Check if we're in a nightly build.
 ///
diff --git a/src/expr.rs b/src/expr.rs
index 45804b5b701a..3d9e7b502dab 100644
--- a/src/expr.rs
+++ b/src/expr.rs
@@ -8,14 +8,13 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::cmp::min;
 use std::borrow::Cow;
+use std::cmp::min;
 use std::iter::{repeat, ExactSizeIterator};
 
 use syntax::{ast, ptr};
 use syntax::codemap::{BytePos, CodeMap, Span};
 
-use spanned::Spanned;
 use chains::rewrite_chain;
 use closures;
 use codemap::{LineRangeUtils, SpanUtils};
@@ -29,6 +28,7 @@ use macros::{rewrite_macro, MacroArg, MacroPosition};
 use patterns::{can_be_overflowed_pat, TuplePatField};
 use rewrite::{Rewrite, RewriteContext};
 use shape::{Indent, Shape};
+use spanned::Spanned;
 use string::{rewrite_string, StringFormat};
 use types::{can_be_overflowed_type, rewrite_path, PathContext};
 use utils::{colon_spaces, contains_skip, extra_offset, first_line_width, inner_attributes,
diff --git a/src/filemap.rs b/src/filemap.rs
index 5678dd59c55b..81f950cfb9b5 100644
--- a/src/filemap.rs
+++ b/src/filemap.rs
@@ -120,7 +120,7 @@ where
     match config.write_mode() {
         WriteMode::Replace => {
             let filename = filename_to_path();
-            if let Ok((ori, fmt)) = source_and_formatted_text(text, &filename, config) {
+            if let Ok((ori, fmt)) = source_and_formatted_text(text, filename, config) {
                 if fmt != ori {
                     // Do a little dance to make writing safer - write to a temp file
                     // rename the original to a .bk, then rename the temp file to the
@@ -141,7 +141,7 @@ where
         WriteMode::Overwrite => {
             // Write text directly over original file if there is a diff.
             let filename = filename_to_path();
-            let (source, formatted) = source_and_formatted_text(text, &filename, config)?;
+            let (source, formatted) = source_and_formatted_text(text, filename, config)?;
             if source != formatted {
                 let file = File::create(filename)?;
                 write_system_newlines(file, text, config)?;
@@ -156,7 +156,7 @@ where
         }
         WriteMode::Diff => {
             let filename = filename_to_path();
-            if let Ok((ori, fmt)) = source_and_formatted_text(text, &filename, config) {
+            if let Ok((ori, fmt)) = source_and_formatted_text(text, filename, config) {
                 let mismatch = make_diff(&ori, &fmt, 3);
                 let has_diff = !mismatch.is_empty();
                 print_diff(
@@ -169,7 +169,7 @@ where
         }
         WriteMode::Checkstyle => {
             let filename = filename_to_path();
-            let diff = create_diff(&filename, text, config)?;
+            let diff = create_diff(filename, text, config)?;
             output_checkstyle_file(out, filename, diff)?;
         }
     }
diff --git a/src/imports.rs b/src/imports.rs
index 53ccd67b7928..dac748af9b1e 100644
--- a/src/imports.rs
+++ b/src/imports.rs
@@ -13,7 +13,6 @@ use std::cmp::Ordering;
 use syntax::ast;
 use syntax::codemap::{BytePos, Span};
 
-use spanned::Spanned;
 use codemap::SpanUtils;
 use comment::combine_strs_with_missing_comments;
 use config::IndentStyle;
@@ -21,6 +20,7 @@ use lists::{definitive_tactic, itemize_list, write_list, DefinitiveListTactic, L
             ListItem, Separator, SeparatorPlace, SeparatorTactic};
 use rewrite::{Rewrite, RewriteContext};
 use shape::Shape;
+use spanned::Spanned;
 use types::{rewrite_path, PathContext};
 use utils::{format_visibility, mk_sp};
 use visitor::{rewrite_extern_crate, FmtVisitor};
diff --git a/src/items.rs b/src/items.rs
index 13b4c0e49405..35dd5c39d384 100644
--- a/src/items.rs
+++ b/src/items.rs
@@ -18,7 +18,6 @@ use syntax::ast::{CrateSugar, ImplItem};
 use syntax::codemap::{BytePos, Span};
 use syntax::visit;
 
-use spanned::Spanned;
 use codemap::{LineRangeUtils, SpanUtils};
 use comment::{combine_strs_with_missing_comments, contains_comment, recover_comment_removed,
               recover_missing_comment_in_span, rewrite_missing_comment, FindUncommented};
@@ -29,6 +28,7 @@ use lists::{definitive_tactic, itemize_list, write_list, DefinitiveListTactic, L
             ListItem, ListTactic, Separator, SeparatorPlace, SeparatorTactic};
 use rewrite::{Rewrite, RewriteContext};
 use shape::{Indent, Shape};
+use spanned::Spanned;
 use types::join_bounds;
 use utils::{colon_spaces, contains_skip, end_typaram, first_line_width, format_abi,
             format_constness, format_defaultness, format_mutability, format_unsafety,
diff --git a/src/modules.rs b/src/modules.rs
index 81414ee175e6..0f439910324e 100644
--- a/src/modules.rs
+++ b/src/modules.rs
@@ -9,8 +9,8 @@
 // except according to those terms.
 
 use std::collections::BTreeMap;
-use std::path::{Path, PathBuf};
 use std::io;
+use std::path::{Path, PathBuf};
 
 use syntax::ast;
 use syntax::codemap::{self, FileName};
diff --git a/src/patterns.rs b/src/patterns.rs
index 700fbd0da218..f877239f5189 100644
--- a/src/patterns.rs
+++ b/src/patterns.rs
@@ -12,7 +12,6 @@ use syntax::ast::{self, BindingMode, FieldPat, Pat, PatKind, RangeEnd, RangeSynt
 use syntax::codemap::{self, BytePos, Span};
 use syntax::ptr;
 
-use spanned::Spanned;
 use codemap::SpanUtils;
 use comment::FindUncommented;
 use expr::{can_be_overflowed_expr, rewrite_call_inner, rewrite_pair, rewrite_unary_prefix,
@@ -22,6 +21,7 @@ use lists::{itemize_list, shape_for_tactic, struct_lit_formatting, struct_lit_sh
 use macros::{rewrite_macro, MacroPosition};
 use rewrite::{Rewrite, RewriteContext};
 use shape::Shape;
+use spanned::Spanned;
 use types::{rewrite_path, PathContext};
 use utils::{format_mutability, mk_sp};
 
diff --git a/src/types.rs b/src/types.rs
index a1156a7b4bbe..77dffd3cd89d 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -16,7 +16,6 @@ use syntax::codemap::{self, BytePos, Span};
 use syntax::print::pprust;
 use syntax::symbol::keywords;
 
-use spanned::Spanned;
 use codemap::SpanUtils;
 use config::{IndentStyle, TypeDensity};
 use expr::{rewrite_pair, rewrite_tuple, rewrite_unary_prefix, wrap_args_with_parens, PairParts};
@@ -26,6 +25,7 @@ use lists::{definitive_tactic, itemize_list, write_list, ListFormatting, ListTac
 use macros::{rewrite_macro, MacroPosition};
 use rewrite::{Rewrite, RewriteContext};
 use shape::Shape;
+use spanned::Spanned;
 use utils::{colon_spaces, extra_offset, first_line_width, format_abi, format_mutability,
             last_line_width, mk_sp};
 
diff --git a/src/vertical.rs b/src/vertical.rs
index d3b35677407f..9644f76cca42 100644
--- a/src/vertical.rs
+++ b/src/vertical.rs
@@ -15,7 +15,6 @@ use std::cmp;
 use syntax::ast;
 use syntax::codemap::{BytePos, Span};
 
-use spanned::Spanned;
 use codemap::SpanUtils;
 use comment::{combine_strs_with_missing_comments, contains_comment};
 use expr::rewrite_field;
@@ -24,6 +23,7 @@ use lists::{definitive_tactic, itemize_list, write_list, ListFormatting, ListTac
             SeparatorPlace};
 use rewrite::{Rewrite, RewriteContext};
 use shape::{Indent, Shape};
+use spanned::Spanned;
 use utils::{contains_skip, is_attributes_extendable, mk_sp};
 
 pub trait AlignedItem {
diff --git a/src/visitor.rs b/src/visitor.rs
index ae9f7a091f92..095f5c6865b1 100644
--- a/src/visitor.rs
+++ b/src/visitor.rs
@@ -15,13 +15,12 @@ use syntax::attr::HasAttrs;
 use syntax::codemap::{self, BytePos, CodeMap, Pos, Span};
 use syntax::parse::ParseSess;
 
-use expr::rewrite_literal;
-use spanned::Spanned;
 use codemap::{LineRangeUtils, SpanUtils};
 use comment::{combine_strs_with_missing_comments, contains_comment, remove_trailing_white_spaces,
               CodeCharKind, CommentCodeSlices, FindUncommented};
 use comment::rewrite_comment;
 use config::{BraceStyle, Config};
+use expr::rewrite_literal;
 use items::{format_impl, format_trait, format_trait_alias, rewrite_associated_impl_type,
             rewrite_associated_type, rewrite_type_alias, FnSig, StaticParts, StructParts};
 use lists::{itemize_list, write_list, DefinitiveListTactic, ListFormatting, SeparatorPlace,
@@ -30,6 +29,7 @@ use macros::{rewrite_macro, MacroPosition};
 use regex::Regex;
 use rewrite::{Rewrite, RewriteContext};
 use shape::{Indent, Shape};
+use spanned::Spanned;
 use utils::{self, contains_skip, count_newlines, inner_attributes, mk_sp, ptr_vec_to_ref_vec};
 
 fn is_use_item(item: &ast::Item) -> bool {

From 939a6c58202f775a63e46fbde4e0d6b3b04cf8aa Mon Sep 17 00:00:00 2001
From: Seiichi Uchida <seuchida@gmail.com>
Date: Sun, 24 Dec 2017 00:29:59 +0900
Subject: [PATCH 5/5] Get rid of GenericsArg wrapper type

`GenericsArg` is basically identical to `ast::GenericParam`.
Just use the latter.
---
 src/items.rs   | 57 +++++++++++++-------------------------------------
 src/spanned.rs |  9 ++++++++
 src/utils.rs   | 13 ------------
 3 files changed, 23 insertions(+), 56 deletions(-)

diff --git a/src/items.rs b/src/items.rs
index 35dd5c39d384..d09d95699b7d 100644
--- a/src/items.rs
+++ b/src/items.rs
@@ -30,9 +30,9 @@ use rewrite::{Rewrite, RewriteContext};
 use shape::{Indent, Shape};
 use spanned::Spanned;
 use types::join_bounds;
-use utils::{colon_spaces, contains_skip, end_typaram, first_line_width, format_abi,
-            format_constness, format_defaultness, format_mutability, format_unsafety,
-            format_visibility, is_attributes_extendable, last_line_contains_single_line_comment,
+use utils::{colon_spaces, contains_skip, first_line_width, format_abi, format_constness,
+            format_defaultness, format_mutability, format_unsafety, format_visibility,
+            is_attributes_extendable, last_line_contains_single_line_comment,
             last_line_used_width, last_line_width, mk_sp, semicolon_for_expr, starts_with_newline,
             stmt_expr, trim_newlines, trimmed_last_line_width};
 use vertical::rewrite_with_alignment;
@@ -1871,12 +1871,8 @@ fn rewrite_fn_base(
         .generics
         .params
         .iter()
-        .filter_map(|p| match p {
-            &ast::GenericParam::Type(ref t) => Some(t),
-            _ => None,
-        })
         .last()
-        .map_or(lo_after_visibility, |tp| end_typaram(tp));
+        .map_or(lo_after_visibility, |param| param.span().hi());
     let args_end = if fd.inputs.is_empty() {
         context
             .codemap
@@ -2346,47 +2342,13 @@ fn rewrite_generics_inner(
     // FIXME: convert bounds to where clauses where they get too big or if
     // there is a where clause at all.
 
-    // Wrapper type
-    enum GenericsArg<'a> {
-        Lifetime(&'a ast::LifetimeDef),
-        TyParam(&'a ast::TyParam),
-    }
-    impl<'a> Rewrite for GenericsArg<'a> {
-        fn rewrite(&self, context: &RewriteContext, shape: Shape) -> Option<String> {
-            match *self {
-                GenericsArg::Lifetime(lifetime) => lifetime.rewrite(context, shape),
-                GenericsArg::TyParam(ty) => ty.rewrite(context, shape),
-            }
-        }
-    }
-    impl<'a> Spanned for GenericsArg<'a> {
-        fn span(&self) -> Span {
-            match *self {
-                GenericsArg::Lifetime(lifetime) => lifetime.span(),
-                GenericsArg::TyParam(ty) => ty.span(),
-            }
-        }
-    }
-
     if generics.params.is_empty() {
         return Some(String::new());
     }
 
-    let generics_args = generics
-        .params
-        .iter()
-        .filter_map(|p| match p {
-            &ast::GenericParam::Lifetime(ref l) => Some(l),
-            _ => None,
-        })
-        .map(|lt| GenericsArg::Lifetime(lt))
-        .chain(generics.params.iter().filter_map(|ty| match ty {
-            &ast::GenericParam::Type(ref ty) => Some(GenericsArg::TyParam(ty)),
-            _ => None,
-        }));
     let items = itemize_list(
         context.codemap,
-        generics_args,
+        generics.params.iter(),
         ">",
         ",",
         |arg| arg.span().lo(),
@@ -2868,3 +2830,12 @@ impl Rewrite for ast::ForeignItem {
         )
     }
 }
+
+impl Rewrite for ast::GenericParam {
+    fn rewrite(&self, context: &RewriteContext, shape: Shape) -> Option<String> {
+        match *self {
+            ast::GenericParam::Lifetime(ref lifetime_def) => lifetime_def.rewrite(context, shape),
+            ast::GenericParam::Type(ref ty) => ty.rewrite(context, shape),
+        }
+    }
+}
diff --git a/src/spanned.rs b/src/spanned.rs
index 7181512273ef..eb36a1174289 100644
--- a/src/spanned.rs
+++ b/src/spanned.rs
@@ -105,6 +105,15 @@ impl Spanned for ast::Arg {
     }
 }
 
+impl Spanned for ast::GenericParam {
+    fn span(&self) -> Span {
+        match *self {
+            ast::GenericParam::Lifetime(ref lifetime_def) => lifetime_def.span(),
+            ast::GenericParam::Type(ref ty) => ty.span(),
+        }
+    }
+}
+
 impl Spanned for ast::StructField {
     fn span(&self) -> Span {
         span_with_attrs_lo_hi!(self, self.span.lo(), self.ty.span.hi())
diff --git a/src/utils.rs b/src/utils.rs
index 7d3fcf73d565..1bad8aecdf41 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -213,19 +213,6 @@ pub fn contains_skip(attrs: &[Attribute]) -> bool {
         .any(|a| a.meta().map_or(false, |a| is_skip(&a)))
 }
 
-// Find the end of a TyParam
-#[inline]
-pub fn end_typaram(typaram: &ast::TyParam) -> BytePos {
-    typaram
-        .bounds
-        .last()
-        .map_or(typaram.span, |bound| match *bound {
-            ast::RegionTyParamBound(ref lt) => lt.span,
-            ast::TraitTyParamBound(ref prt, _) => prt.span,
-        })
-        .hi()
-}
-
 #[inline]
 pub fn semicolon_for_expr(context: &RewriteContext, expr: &ast::Expr) -> bool {
     match expr.node {