Implement JsonSchema on indexmap types

schemars/tests/expected/indexmap.json

@@ -0,0 +1,24 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "IndexMapTypes",
+  "type": "object",
+  "required": [
+    "map",
+    "set"
+  ],
+  "properties": {
+    "map": {
+      "type": "object",
+      "additionalProperties": {
+        "type": "boolean"
+      }
+    },
+    "set": {
+      "type": "array",
+      "items": {
+        "type": "integer",
+        "format": "int"
+      }
+    }
+  }
+}

schemars/tests/indexmap.rs

@@ -0,0 +1,15 @@
+mod util;
+use indexmap::{IndexMap, IndexSet};
+use schemars::JsonSchema;
+use util::*;
+
+#[derive(Debug, JsonSchema)]
+struct IndexMapTypes {
+    map: IndexMap<i32, bool>,
+    set: IndexSet<isize>,
+}
+
+#[test]
+fn chrono_types() -> TestResult {
+    test_default_generated_schema::<IndexMapTypes>("indexmap")
+}