fix(repl): do not panic for import completions when the import specif…

…ier is empty (#15177)

cli/lsp/completions.rs

@@ -104,9 +104,16 @@ fn to_narrow_lsp_range(
       column_index: range.end.character,
     })
     .as_byte_index(text_info.range().start);
+  let start_byte_index = text_info
+    .loc_to_source_pos(LineAndColumnIndex {
+      line_index: range.start.line,
+      column_index: range.start.character,
+    })
+    .as_byte_index(text_info.range().start);
   let text_bytes = text_info.text_str().as_bytes();
+  let is_empty = end_byte_index - 1 == start_byte_index;
   let has_trailing_quote =
-    matches!(text_bytes[end_byte_index - 1], b'"' | b'\'');
+    !is_empty && matches!(text_bytes[end_byte_index - 1], b'"' | b'\'');
   lsp::Range {
     start: lsp::Position {
       line: range.start.line as u32,

cli/tests/integration/repl_tests.rs

@@ -185,6 +185,11 @@ fn pty_complete_imports() {
     let output = console.read_all_output();
     assert_contains!(output, "Hello World");
   });
+
+  // does not panic when tabbing when empty
+  util::with_pty(&["repl"], |mut console| {
+    console.write_line("import '\t");
+  });
 }
 
 #[test]