Rust symbol queries (#12859)

Author: EricHenry

book/src/generated/lang-support.md

@@ -182,7 +182,7 @@
 | ron | ✓ |  | ✓ |  |  |
 | rst | ✓ |  |  |  |  |
 | ruby | ✓ | ✓ | ✓ |  | `solargraph` |
-| rust | ✓ | ✓ | ✓ |  | `rust-analyzer` |
+| rust | ✓ | ✓ | ✓ | ✓ | `rust-analyzer` |
 | sage | ✓ | ✓ |  |  |  |
 | scala | ✓ | ✓ | ✓ |  | `metals` |
 | scheme | ✓ |  | ✓ |  |  |

runtime/queries/rust/symbols.scm

@@ -0,0 +1,33 @@
+(struct_item
+  name: (type_identifier) @definition.struct
+  body: (field_declaration_list))
+
+(const_item
+  name: (identifier) @definition.constant)
+
+(trait_item
+  name: (type_identifier) @definition.interface
+  body: (declaration_list))
+
+(function_item
+  name: (identifier) @definition.function
+  parameters: (parameters)
+  body: (block))
+
+(function_signature_item
+  name: (identifier) @definition.function
+  parameters: (parameters))
+
+(enum_item
+  name: (type_identifier) @definition.type
+  body: (enum_variant_list))
+
+(enum_variant
+  name: (identifier) @definition.struct)
+
+(mod_item
+  name: (identifier) @definition.module
+  body: (declaration_list))
+
+(macro_definition
+  macro: (identifier) @definition.macro)