rustdoc search: relax rules for identifiers

Author: lolbinarycat

src/librustdoc/html/static/js/search.js

@@ -149,7 +149,10 @@ const ROOT_PATH = typeof window !== "undefined" ? window.rootPath : "../";
 const UNBOXING_LIMIT = 5;
 
 // used for search query verification
-const REGEX_IDENT = /\p{ID_Start}\p{ID_Continue}*|_\p{ID_Continue}+/uy;
+// because searches are often performed using substrings of identifiers,
+// and not just full identiferes, we allow them to start with chars that otherwise
+// can only appear in the middle of identifiers
+const REGEX_IDENT = /\p{ID_Continue}+/uy;
 const REGEX_INVALID_TYPE_FILTER = /[^a-z]/ui;
 
 const MAX_RESULTS = 200;

tests/rustdoc-js-std/parser-errors.js

@@ -165,7 +165,7 @@ const PARSED = [
  foundElems: 0,
  userQuery: "_:",
  returned: [],
- error: "Unexpected `_` (not a valid identifier)",
+ error: "Unexpected `_` in type filter (before `:`)",
  },
  {
  query: "ab:",

tests/rustdoc-js-std/search-by-number.js

@@ -0,0 +1,12 @@
+// regression test for https://github.com/rust-lang/rust/issues/147763
+
+const EXPECTED = {
+ 'query': '8',
+ 'others': [
+ {
+ 'path': 'std',
+ 'name': 'i8',
+ 'href': '../std/primitive.i8.html',
+ },
+ ]
+};