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-rw-r--r--crates/ide_db/src/assists.rs136
-rw-r--r--crates/ide_db/src/lib.rs5
-rw-r--r--crates/ide_db/src/rename.rs468
3 files changed, 608 insertions, 1 deletions
diff --git a/crates/ide_db/src/assists.rs b/crates/ide_db/src/assists.rs
new file mode 100644
index 000000000..7881d8369
--- /dev/null
+++ b/crates/ide_db/src/assists.rs
@@ -0,0 +1,136 @@
1//! This module defines the `Assist` data structure. The actual assist live in
2//! the `ide_assists` downstream crate. We want to define the data structures in
3//! this low-level crate though, because `ide_diagnostics` also need them
4//! (fixits for diagnostics and assists are the same thing under the hood). We
5//! want to compile `ide_assists` and `ide_diagnostics` in parallel though, so
6//! we pull the common definitions upstream, to this crate.
7
8use std::str::FromStr;
9
10use syntax::TextRange;
11
12use crate::{label::Label, source_change::SourceChange};
13
14#[derive(Debug, Clone)]
15pub struct Assist {
16 pub id: AssistId,
17 /// Short description of the assist, as shown in the UI.
18 pub label: Label,
19 pub group: Option<GroupLabel>,
20 /// Target ranges are used to sort assists: the smaller the target range,
21 /// the more specific assist is, and so it should be sorted first.
22 pub target: TextRange,
23 /// Computing source change sometimes is much more costly then computing the
24 /// other fields. Additionally, the actual change is not required to show
25 /// the lightbulb UI, it only is needed when the user tries to apply an
26 /// assist. So, we compute it lazily: the API allow requesting assists with
27 /// or without source change. We could (and in fact, used to) distinguish
28 /// between resolved and unresolved assists at the type level, but this is
29 /// cumbersome, especially if you want to embed an assist into another data
30 /// structure, such as a diagnostic.
31 pub source_change: Option<SourceChange>,
32}
33
34#[derive(Debug, Clone, Copy, PartialEq, Eq)]
35pub enum AssistKind {
36 // FIXME: does the None variant make sense? Probably not.
37 None,
38
39 QuickFix,
40 Generate,
41 Refactor,
42 RefactorExtract,
43 RefactorInline,
44 RefactorRewrite,
45}
46
47impl AssistKind {
48 pub fn contains(self, other: AssistKind) -> bool {
49 if self == other {
50 return true;
51 }
52
53 match self {
54 AssistKind::None | AssistKind::Generate => true,
55 AssistKind::Refactor => match other {
56 AssistKind::RefactorExtract
57 | AssistKind::RefactorInline
58 | AssistKind::RefactorRewrite => true,
59 _ => false,
60 },
61 _ => false,
62 }
63 }
64
65 pub fn name(&self) -> &str {
66 match self {
67 AssistKind::None => "None",
68 AssistKind::QuickFix => "QuickFix",
69 AssistKind::Generate => "Generate",
70 AssistKind::Refactor => "Refactor",
71 AssistKind::RefactorExtract => "RefactorExtract",
72 AssistKind::RefactorInline => "RefactorInline",
73 AssistKind::RefactorRewrite => "RefactorRewrite",
74 }
75 }
76}
77
78impl FromStr for AssistKind {
79 type Err = String;
80
81 fn from_str(s: &str) -> Result<Self, Self::Err> {
82 match s {
83 "None" => Ok(AssistKind::None),
84 "QuickFix" => Ok(AssistKind::QuickFix),
85 "Generate" => Ok(AssistKind::Generate),
86 "Refactor" => Ok(AssistKind::Refactor),
87 "RefactorExtract" => Ok(AssistKind::RefactorExtract),
88 "RefactorInline" => Ok(AssistKind::RefactorInline),
89 "RefactorRewrite" => Ok(AssistKind::RefactorRewrite),
90 unknown => Err(format!("Unknown AssistKind: '{}'", unknown)),
91 }
92 }
93}
94
95/// Unique identifier of the assist, should not be shown to the user
96/// directly.
97#[derive(Debug, Clone, Copy, PartialEq, Eq)]
98pub struct AssistId(pub &'static str, pub AssistKind);
99
100/// A way to control how many asssist to resolve during the assist resolution.
101/// When an assist is resolved, its edits are calculated that might be costly to always do by default.
102#[derive(Debug)]
103pub enum AssistResolveStrategy {
104 /// No assists should be resolved.
105 None,
106 /// All assists should be resolved.
107 All,
108 /// Only a certain assist should be resolved.
109 Single(SingleResolve),
110}
111
112/// Hold the [`AssistId`] data of a certain assist to resolve.
113/// The original id object cannot be used due to a `'static` lifetime
114/// and the requirement to construct this struct dynamically during the resolve handling.
115#[derive(Debug)]
116pub struct SingleResolve {
117 /// The id of the assist.
118 pub assist_id: String,
119 // The kind of the assist.
120 pub assist_kind: AssistKind,
121}
122
123impl AssistResolveStrategy {
124 pub fn should_resolve(&self, id: &AssistId) -> bool {
125 match self {
126 AssistResolveStrategy::None => false,
127 AssistResolveStrategy::All => true,
128 AssistResolveStrategy::Single(single_resolve) => {
129 single_resolve.assist_id == id.0 && single_resolve.assist_kind == id.1
130 }
131 }
132 }
133}
134
135#[derive(Clone, Debug)]
136pub struct GroupLabel(pub String);
diff --git a/crates/ide_db/src/lib.rs b/crates/ide_db/src/lib.rs
index 105607dca..7bbd08d6f 100644
--- a/crates/ide_db/src/lib.rs
+++ b/crates/ide_db/src/lib.rs
@@ -3,11 +3,11 @@
3//! It is mainly a `HirDatabase` for semantic analysis, plus a `SymbolsDatabase`, for fuzzy search. 3//! It is mainly a `HirDatabase` for semantic analysis, plus a `SymbolsDatabase`, for fuzzy search.
4 4
5mod apply_change; 5mod apply_change;
6pub mod assists;
6pub mod label; 7pub mod label;
7pub mod line_index; 8pub mod line_index;
8pub mod symbol_index; 9pub mod symbol_index;
9pub mod defs; 10pub mod defs;
10pub mod search;
11pub mod items_locator; 11pub mod items_locator;
12pub mod source_change; 12pub mod source_change;
13pub mod ty_filter; 13pub mod ty_filter;
@@ -15,6 +15,9 @@ pub mod traits;
15pub mod call_info; 15pub mod call_info;
16pub mod helpers; 16pub mod helpers;
17 17
18pub mod search;
19pub mod rename;
20
18use std::{fmt, sync::Arc}; 21use std::{fmt, sync::Arc};
19 22
20use base_db::{ 23use base_db::{
diff --git a/crates/ide_db/src/rename.rs b/crates/ide_db/src/rename.rs
new file mode 100644
index 000000000..82855725f
--- /dev/null
+++ b/crates/ide_db/src/rename.rs
@@ -0,0 +1,468 @@
1//! Rename infrastructure for rust-analyzer. It is used primarily for the
2//! literal "rename" in the ide (look for tests there), but it is also available
3//! as a general-purpose service. For example, it is used by the fix for the
4//! "incorrect case" diagnostic.
5//!
6//! It leverages the [`crate::search`] functionality to find what needs to be
7//! renamed. The actual renames are tricky -- field shorthands need special
8//! attention, and, when renaming modules, you also want to rename files on the
9//! file system.
10//!
11//! Another can of worms are macros:
12//!
13//! ```
14//! macro_rules! m { () => { fn f() {} } }
15//! m!();
16//! fn main() {
17//! f() // <- rename me
18//! }
19//! ```
20//!
21//! The correct behavior in such cases is probably to show a dialog to the user.
22//! Our current behavior is ¯\_(ツ)_/¯.
23use std::fmt;
24
25use base_db::{AnchoredPathBuf, FileId, FileRange};
26use either::Either;
27use hir::{AsAssocItem, FieldSource, HasSource, InFile, ModuleSource, Semantics};
28use stdx::never;
29use syntax::{
30 ast::{self, NameOwner},
31 lex_single_syntax_kind, AstNode, SyntaxKind, TextRange, T,
32};
33use text_edit::TextEdit;
34
35use crate::{
36 defs::Definition,
37 search::FileReference,
38 source_change::{FileSystemEdit, SourceChange},
39 RootDatabase,
40};
41
42pub type Result<T, E = RenameError> = std::result::Result<T, E>;
43
44#[derive(Debug)]
45pub struct RenameError(pub String);
46
47impl fmt::Display for RenameError {
48 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
49 fmt::Display::fmt(&self.0, f)
50 }
51}
52
53#[macro_export]
54macro_rules! _format_err {
55 ($fmt:expr) => { RenameError(format!($fmt)) };
56 ($fmt:expr, $($arg:tt)+) => { RenameError(format!($fmt, $($arg)+)) }
57}
58pub use _format_err as format_err;
59
60#[macro_export]
61macro_rules! _bail {
62 ($($tokens:tt)*) => { return Err(format_err!($($tokens)*)) }
63}
64pub use _bail as bail;
65
66impl Definition {
67 pub fn rename(&self, sema: &Semantics<RootDatabase>, new_name: &str) -> Result<SourceChange> {
68 match *self {
69 Definition::ModuleDef(hir::ModuleDef::Module(module)) => {
70 rename_mod(sema, module, new_name)
71 }
72 Definition::ModuleDef(hir::ModuleDef::BuiltinType(_)) => {
73 bail!("Cannot rename builtin type")
74 }
75 Definition::SelfType(_) => bail!("Cannot rename `Self`"),
76 def => rename_reference(sema, def, new_name),
77 }
78 }
79
80 /// Textual range of the identifier which will change when renaming this
81 /// `Definition`. Note that some definitions, like buitin types, can't be
82 /// renamed.
83 pub fn range_for_rename(self, sema: &Semantics<RootDatabase>) -> Option<FileRange> {
84 // FIXME: the `original_file_range` calls here are wrong -- they never fail,
85 // and _fall back_ to the entirety of the macro call. Such fall back is
86 // incorrect for renames. The safe behavior would be to return an error for
87 // such cases. The correct behavior would be to return an auxiliary list of
88 // "can't rename these occurrences in macros" items, and then show some kind
89 // of a dialog to the user. See:
90 cov_mark::hit!(macros_are_broken_lol);
91
92 let res = match self {
93 Definition::Macro(mac) => {
94 let src = mac.source(sema.db)?;
95 let name = match &src.value {
96 Either::Left(it) => it.name()?,
97 Either::Right(it) => it.name()?,
98 };
99 src.with_value(name.syntax()).original_file_range(sema.db)
100 }
101 Definition::Field(field) => {
102 let src = field.source(sema.db)?;
103
104 match &src.value {
105 FieldSource::Named(record_field) => {
106 let name = record_field.name()?;
107 src.with_value(name.syntax()).original_file_range(sema.db)
108 }
109 FieldSource::Pos(_) => {
110 return None;
111 }
112 }
113 }
114 Definition::ModuleDef(module_def) => match module_def {
115 hir::ModuleDef::Module(module) => {
116 let src = module.declaration_source(sema.db)?;
117 let name = src.value.name()?;
118 src.with_value(name.syntax()).original_file_range(sema.db)
119 }
120 hir::ModuleDef::Function(it) => name_range(it, sema)?,
121 hir::ModuleDef::Adt(adt) => match adt {
122 hir::Adt::Struct(it) => name_range(it, sema)?,
123 hir::Adt::Union(it) => name_range(it, sema)?,
124 hir::Adt::Enum(it) => name_range(it, sema)?,
125 },
126 hir::ModuleDef::Variant(it) => name_range(it, sema)?,
127 hir::ModuleDef::Const(it) => name_range(it, sema)?,
128 hir::ModuleDef::Static(it) => name_range(it, sema)?,
129 hir::ModuleDef::Trait(it) => name_range(it, sema)?,
130 hir::ModuleDef::TypeAlias(it) => name_range(it, sema)?,
131 hir::ModuleDef::BuiltinType(_) => return None,
132 },
133 Definition::SelfType(_) => return None,
134 Definition::Local(local) => {
135 let src = local.source(sema.db);
136 let name = match &src.value {
137 Either::Left(bind_pat) => bind_pat.name()?,
138 Either::Right(_) => return None,
139 };
140 src.with_value(name.syntax()).original_file_range(sema.db)
141 }
142 Definition::GenericParam(generic_param) => match generic_param {
143 hir::GenericParam::TypeParam(type_param) => {
144 let src = type_param.source(sema.db)?;
145 let name = match &src.value {
146 Either::Left(_) => return None,
147 Either::Right(type_param) => type_param.name()?,
148 };
149 src.with_value(name.syntax()).original_file_range(sema.db)
150 }
151 hir::GenericParam::LifetimeParam(lifetime_param) => {
152 let src = lifetime_param.source(sema.db)?;
153 let lifetime = src.value.lifetime()?;
154 src.with_value(lifetime.syntax()).original_file_range(sema.db)
155 }
156 hir::GenericParam::ConstParam(it) => name_range(it, sema)?,
157 },
158 Definition::Label(label) => {
159 let src = label.source(sema.db);
160 let lifetime = src.value.lifetime()?;
161 src.with_value(lifetime.syntax()).original_file_range(sema.db)
162 }
163 };
164 return Some(res);
165
166 fn name_range<D>(def: D, sema: &Semantics<RootDatabase>) -> Option<FileRange>
167 where
168 D: HasSource,
169 D::Ast: ast::NameOwner,
170 {
171 let src = def.source(sema.db)?;
172 let name = src.value.name()?;
173 let res = src.with_value(name.syntax()).original_file_range(sema.db);
174 Some(res)
175 }
176 }
177}
178
179fn rename_mod(
180 sema: &Semantics<RootDatabase>,
181 module: hir::Module,
182 new_name: &str,
183) -> Result<SourceChange> {
184 if IdentifierKind::classify(new_name)? != IdentifierKind::Ident {
185 bail!("Invalid name `{0}`: cannot rename module to {0}", new_name);
186 }
187
188 let mut source_change = SourceChange::default();
189
190 let InFile { file_id, value: def_source } = module.definition_source(sema.db);
191 let file_id = file_id.original_file(sema.db);
192 if let ModuleSource::SourceFile(..) = def_source {
193 // mod is defined in path/to/dir/mod.rs
194 let path = if module.is_mod_rs(sema.db) {
195 format!("../{}/mod.rs", new_name)
196 } else {
197 format!("{}.rs", new_name)
198 };
199 let dst = AnchoredPathBuf { anchor: file_id, path };
200 let move_file = FileSystemEdit::MoveFile { src: file_id, dst };
201 source_change.push_file_system_edit(move_file);
202 }
203
204 if let Some(InFile { file_id, value: decl_source }) = module.declaration_source(sema.db) {
205 let file_id = file_id.original_file(sema.db);
206 match decl_source.name() {
207 Some(name) => source_change.insert_source_edit(
208 file_id,
209 TextEdit::replace(name.syntax().text_range(), new_name.to_string()),
210 ),
211 _ => never!("Module source node is missing a name"),
212 }
213 }
214 let def = Definition::ModuleDef(hir::ModuleDef::Module(module));
215 let usages = def.usages(sema).all();
216 let ref_edits = usages.iter().map(|(&file_id, references)| {
217 (file_id, source_edit_from_references(references, def, new_name))
218 });
219 source_change.extend(ref_edits);
220
221 Ok(source_change)
222}
223
224fn rename_reference(
225 sema: &Semantics<RootDatabase>,
226 mut def: Definition,
227 new_name: &str,
228) -> Result<SourceChange> {
229 let ident_kind = IdentifierKind::classify(new_name)?;
230
231 if matches!(
232 def, // is target a lifetime?
233 Definition::GenericParam(hir::GenericParam::LifetimeParam(_)) | Definition::Label(_)
234 ) {
235 match ident_kind {
236 IdentifierKind::Ident | IdentifierKind::Underscore => {
237 cov_mark::hit!(rename_not_a_lifetime_ident_ref);
238 bail!("Invalid name `{}`: not a lifetime identifier", new_name);
239 }
240 IdentifierKind::Lifetime => cov_mark::hit!(rename_lifetime),
241 }
242 } else {
243 match (ident_kind, def) {
244 (IdentifierKind::Lifetime, _) => {
245 cov_mark::hit!(rename_not_an_ident_ref);
246 bail!("Invalid name `{}`: not an identifier", new_name);
247 }
248 (IdentifierKind::Ident, _) => cov_mark::hit!(rename_non_local),
249 (IdentifierKind::Underscore, _) => (),
250 }
251 }
252
253 def = match def {
254 // HACK: resolve trait impl items to the item def of the trait definition
255 // so that we properly resolve all trait item references
256 Definition::ModuleDef(mod_def) => mod_def
257 .as_assoc_item(sema.db)
258 .and_then(|it| it.containing_trait_impl(sema.db))
259 .and_then(|it| {
260 it.items(sema.db).into_iter().find_map(|it| match (it, mod_def) {
261 (hir::AssocItem::Function(trait_func), hir::ModuleDef::Function(func))
262 if trait_func.name(sema.db) == func.name(sema.db) =>
263 {
264 Some(Definition::ModuleDef(hir::ModuleDef::Function(trait_func)))
265 }
266 (hir::AssocItem::Const(trait_konst), hir::ModuleDef::Const(konst))
267 if trait_konst.name(sema.db) == konst.name(sema.db) =>
268 {
269 Some(Definition::ModuleDef(hir::ModuleDef::Const(trait_konst)))
270 }
271 (
272 hir::AssocItem::TypeAlias(trait_type_alias),
273 hir::ModuleDef::TypeAlias(type_alias),
274 ) if trait_type_alias.name(sema.db) == type_alias.name(sema.db) => {
275 Some(Definition::ModuleDef(hir::ModuleDef::TypeAlias(trait_type_alias)))
276 }
277 _ => None,
278 })
279 })
280 .unwrap_or(def),
281 _ => def,
282 };
283 let usages = def.usages(sema).all();
284
285 if !usages.is_empty() && ident_kind == IdentifierKind::Underscore {
286 cov_mark::hit!(rename_underscore_multiple);
287 bail!("Cannot rename reference to `_` as it is being referenced multiple times");
288 }
289 let mut source_change = SourceChange::default();
290 source_change.extend(usages.iter().map(|(&file_id, references)| {
291 (file_id, source_edit_from_references(references, def, new_name))
292 }));
293
294 let (file_id, edit) = source_edit_from_def(sema, def, new_name)?;
295 source_change.insert_source_edit(file_id, edit);
296 Ok(source_change)
297}
298
299pub fn source_edit_from_references(
300 references: &[FileReference],
301 def: Definition,
302 new_name: &str,
303) -> TextEdit {
304 let mut edit = TextEdit::builder();
305 for reference in references {
306 let (range, replacement) = match &reference.name {
307 // if the ranges differ then the node is inside a macro call, we can't really attempt
308 // to make special rewrites like shorthand syntax and such, so just rename the node in
309 // the macro input
310 ast::NameLike::NameRef(name_ref)
311 if name_ref.syntax().text_range() == reference.range =>
312 {
313 source_edit_from_name_ref(name_ref, new_name, def)
314 }
315 ast::NameLike::Name(name) if name.syntax().text_range() == reference.range => {
316 source_edit_from_name(name, new_name)
317 }
318 _ => None,
319 }
320 .unwrap_or_else(|| (reference.range, new_name.to_string()));
321 edit.replace(range, replacement);
322 }
323 edit.finish()
324}
325
326fn source_edit_from_name(name: &ast::Name, new_name: &str) -> Option<(TextRange, String)> {
327 if let Some(_) = ast::RecordPatField::for_field_name(name) {
328 if let Some(ident_pat) = name.syntax().parent().and_then(ast::IdentPat::cast) {
329 return Some((
330 TextRange::empty(ident_pat.syntax().text_range().start()),
331 [new_name, ": "].concat(),
332 ));
333 }
334 }
335 None
336}
337
338fn source_edit_from_name_ref(
339 name_ref: &ast::NameRef,
340 new_name: &str,
341 def: Definition,
342) -> Option<(TextRange, String)> {
343 if let Some(record_field) = ast::RecordExprField::for_name_ref(name_ref) {
344 let rcf_name_ref = record_field.name_ref();
345 let rcf_expr = record_field.expr();
346 match (rcf_name_ref, rcf_expr.and_then(|it| it.name_ref())) {
347 // field: init-expr, check if we can use a field init shorthand
348 (Some(field_name), Some(init)) => {
349 if field_name == *name_ref {
350 if init.text() == new_name {
351 cov_mark::hit!(test_rename_field_put_init_shorthand);
352 // same names, we can use a shorthand here instead.
353 // we do not want to erase attributes hence this range start
354 let s = field_name.syntax().text_range().start();
355 let e = record_field.syntax().text_range().end();
356 return Some((TextRange::new(s, e), new_name.to_owned()));
357 }
358 } else if init == *name_ref {
359 if field_name.text() == new_name {
360 cov_mark::hit!(test_rename_local_put_init_shorthand);
361 // same names, we can use a shorthand here instead.
362 // we do not want to erase attributes hence this range start
363 let s = field_name.syntax().text_range().start();
364 let e = record_field.syntax().text_range().end();
365 return Some((TextRange::new(s, e), new_name.to_owned()));
366 }
367 }
368 None
369 }
370 // init shorthand
371 // FIXME: instead of splitting the shorthand, recursively trigger a rename of the
372 // other name https://github.com/rust-analyzer/rust-analyzer/issues/6547
373 (None, Some(_)) if matches!(def, Definition::Field(_)) => {
374 cov_mark::hit!(test_rename_field_in_field_shorthand);
375 let s = name_ref.syntax().text_range().start();
376 Some((TextRange::empty(s), format!("{}: ", new_name)))
377 }
378 (None, Some(_)) if matches!(def, Definition::Local(_)) => {
379 cov_mark::hit!(test_rename_local_in_field_shorthand);
380 let s = name_ref.syntax().text_range().end();
381 Some((TextRange::empty(s), format!(": {}", new_name)))
382 }
383 _ => None,
384 }
385 } else if let Some(record_field) = ast::RecordPatField::for_field_name_ref(name_ref) {
386 let rcf_name_ref = record_field.name_ref();
387 let rcf_pat = record_field.pat();
388 match (rcf_name_ref, rcf_pat) {
389 // field: rename
390 (Some(field_name), Some(ast::Pat::IdentPat(pat))) if field_name == *name_ref => {
391 // field name is being renamed
392 if pat.name().map_or(false, |it| it.text() == new_name) {
393 cov_mark::hit!(test_rename_field_put_init_shorthand_pat);
394 // same names, we can use a shorthand here instead/
395 // we do not want to erase attributes hence this range start
396 let s = field_name.syntax().text_range().start();
397 let e = record_field.syntax().text_range().end();
398 Some((TextRange::new(s, e), pat.to_string()))
399 } else {
400 None
401 }
402 }
403 _ => None,
404 }
405 } else {
406 None
407 }
408}
409
410fn source_edit_from_def(
411 sema: &Semantics<RootDatabase>,
412 def: Definition,
413 new_name: &str,
414) -> Result<(FileId, TextEdit)> {
415 let frange = def
416 .range_for_rename(sema)
417 .ok_or_else(|| format_err!("No identifier available to rename"))?;
418
419 let mut replacement_text = String::new();
420 let mut repl_range = frange.range;
421 if let Definition::Local(local) = def {
422 if let Either::Left(pat) = local.source(sema.db).value {
423 if matches!(
424 pat.syntax().parent().and_then(ast::RecordPatField::cast),
425 Some(pat_field) if pat_field.name_ref().is_none()
426 ) {
427 replacement_text.push_str(": ");
428 replacement_text.push_str(new_name);
429 repl_range = TextRange::new(
430 pat.syntax().text_range().end(),
431 pat.syntax().text_range().end(),
432 );
433 }
434 }
435 }
436 if replacement_text.is_empty() {
437 replacement_text.push_str(new_name);
438 }
439 let edit = TextEdit::replace(repl_range, replacement_text);
440 Ok((frange.file_id, edit))
441}
442
443#[derive(Copy, Clone, Debug, PartialEq)]
444pub enum IdentifierKind {
445 Ident,
446 Lifetime,
447 Underscore,
448}
449
450impl IdentifierKind {
451 pub fn classify(new_name: &str) -> Result<IdentifierKind> {
452 match lex_single_syntax_kind(new_name) {
453 Some(res) => match res {
454 (SyntaxKind::IDENT, _) => Ok(IdentifierKind::Ident),
455 (T![_], _) => Ok(IdentifierKind::Underscore),
456 (SyntaxKind::LIFETIME_IDENT, _) if new_name != "'static" && new_name != "'_" => {
457 Ok(IdentifierKind::Lifetime)
458 }
459 (SyntaxKind::LIFETIME_IDENT, _) => {
460 bail!("Invalid name `{}`: not a lifetime identifier", new_name)
461 }
462 (_, Some(syntax_error)) => bail!("Invalid name `{}`: {}", new_name, syntax_error),
463 (_, None) => bail!("Invalid name `{}`: not an identifier", new_name),
464 },
465 None => bail!("Invalid name `{}`: not an identifier", new_name),
466 }
467 }
468}