textDocument/completion failure with indoc literal

[jprochazk]

Typing a. in an indented string literal wrapped inside of indoc, results in a textDocument/completion failure.

Output > Rust Analyzer Language Server

Panic context:
> 
version: 0.3.1325-standalone
request: textDocument/completion CompletionParams {
    text_document_position: TextDocumentPositionParams {
        text_document: TextDocumentIdentifier {
            uri: Url {
                scheme: "file",
                cannot_be_a_base: false,
                username: "",
                password: None,
                host: None,
                port: None,
                path: "/home/jan/dev/ra-completion-fail/src/main.rs",
                query: None,
                fragment: None,
            },
        },
        position: Position {
            line: 8,
            character: 10,
        },
    },
    work_done_progress_params: WorkDoneProgressParams {
        work_done_token: None,
    },
    partial_result_params: PartialResultParams {
        partial_result_token: None,
    },
    context: Some(
        CompletionContext {
            trigger_kind: TriggerCharacter,
            trigger_character: Some(
                ".",
            ),
        },
    ),
}
thread 'Worker' panicked at 'Bad offset: range 0..5 offset 12', /github/home/.cargo/registry/src/github.1485827954.workers.dev-1ecc6299db9ec823/rowan-0.15.10/src/cursor.rs:751:9

stack backtrace:

0: rust_begin_unwind

at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicking.rs:575:5

1: core::panicking::panic_fmt

at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/core/src/panicking.rs:65:14

2: rowan::cursor::SyntaxNode::token_at_offset

3: ide_completion::context::analysis::expand_and_analyze

4: ide_completion::context::CompletionContext::new

5: ide_completion::completions

6: std::panicking::try

7: rust_analyzer::handlers::handle_completion

8: std::panicking::try

9: ::call_box

note: Some details are omitted, run with RUST_BACKTRACE=full for a verbose backtrace.

[Error - 1:02:23 PM] Request textDocument/completion failed.

Message: request handler panicked: Bad offset: range 0..5 offset 12

Code: -32603

Minimal reproducible example is available in this repository, but the code is just:

use indoc::indoc;

fn main() {
    // delete the `.` and type it again
    indoc! {
      "
        a.
      "
    };
}

Not sure if it's relevant, but the following does not fail:

use indoc::indoc;

fn main() {
    // no failure when retyping the `.`
    indoc! {
      "a."
    }
}

---

rust-analyzer version: 0.3.1325-standalone (using vscode plugin)

rustc version: rustc 1.66.0 (69f9c33d7 2022-12-12)

relevant settings: none

[pickx]

I'm going to try this.