Show reason for failed rename refactoring

Return an error with a meaningful message for requests to
`textDocument/rename` if the operation cannot be performed.
Pass errors raised by rename handling code to the LSP runtime.

As a consequence, the VS Code client shows and logs the request
as if a server-side programming error occured.

Resolves https://github.com/rust-analyzer/rust-analyzer/issues/3981

1 files changed, 1 insertions, 0 deletions

diff --git a/crates/ide/src/references.rs b/crates/ide/src/references.rs
index 9315f7354..f65a05ea3 100644
--- a/crates/ide/src/references.rs
+++ b/crates/ide/src/references.rs
@@ -26,6 +26,7 @@ use syntax::{
 use crate::{display::TryToNav, FilePosition, FileRange, NavigationTarget, RangeInfo};
 
 pub(crate) use self::rename::rename;
+pub use self::rename::RenameError;
 
 pub use ide_db::search::{Reference, ReferenceAccess, ReferenceKind};