Apply suggestions:

* Forbid generics without a path (so "<p>" is forbidden).
 * Change `handleSingleArg` so that it takes `results_others`, `results_in_args` and `results_returned` as arguments instead of using the "global" variables.
 * Change `createQueryElement` so that it returns the newly created element instead of taking `elems` as argument.
 * Improve documentation

src/test/rustdoc-js-std/parser-weird-queries.js

@@ -0,0 +1,64 @@
+// This test is mostly to check that the parser still kinda outputs something
+// (and doesn't enter an infinite loop!) even though the query is completely
+// invalid.
+const QUERY = ['a b', 'a   b', 'a,b(c)'];
+
+const PARSED = [
+    {
+        elems: [
+            {
+                name: "a",
+                fullPath: ["a"],
+                pathWithoutLast: [],
+                pathLast: "a",
+                generics: [],
+            },
+            {
+                name: "b",
+                fullPath: ["b"],
+                pathWithoutLast: [],
+                pathLast: "b",
+                generics: [],
+            },
+        ],
+        foundElems: 2,
+        original: "a b",
+        returned: [],
+        typeFilter: -1,
+        userQuery: "a b",
+        error: null,
+    },
+    {
+        elems: [
+            {
+                name: "a",
+                fullPath: ["a"],
+                pathWithoutLast: [],
+                pathLast: "a",
+                generics: [],
+            },
+            {
+                name: "b",
+                fullPath: ["b"],
+                pathWithoutLast: [],
+                pathLast: "b",
+                generics: [],
+            },
+        ],
+        foundElems: 2,
+        original: "a   b",
+        returned: [],
+        typeFilter: -1,
+        userQuery: "a   b",
+        error: null,
+    },
+    {
+        elems: [],
+        foundElems: 0,
+        original: "a,b(c)",
+        returned: [],
+        typeFilter: -1,
+        userQuery: "a,b(c)",
+        error: "Unexpected `(`",
+    },
+];