minor: Add a mbe test for parsing negative literals

Author: Veykril

crates/hir-def/src/nameres/path_resolution.rs

@@ -483,6 +483,7 @@ impl DefMap {
             curr_per_ns = match curr.def {
                 ModuleDefId::ModuleId(module) => {
                     if module.krate != self.krate {
+                        // FIXME: Inefficient
                         let path = ModPath::from_segments(
                             PathKind::SELF,
                             path.segments()[i..].iter().cloned(),

crates/mbe/src/tests.rs

@@ -356,3 +356,120 @@ fn expr_2021() {
             ;"#]],
     );
 }
+
+#[test]
+fn minus_belongs_to_literal() {
+    let decl = r#"
+(-1) => {-1};
+(- 2) => {- 2};
+(- 3.0) => {- 3.0};
+(@$lit:literal) => {$lit}
+"#;
+    let check = |args, expect| check(Edition::CURRENT, Edition::CURRENT, decl, args, expect);
+    check(
+        "-1",
+        expect![[r#"
+            SUBTREE $$ 1:[email protected]#ROOT2024 1:[email protected]#ROOT2024
+              PUNCH   - [alone] 0:[email protected]#ROOT2024
+              LITERAL Integer 1 0:[email protected]#ROOT2024
+
+            -1"#]],
+    );
+    check(
+        "- 1",
+        expect![[r#"
+            SUBTREE $$ 1:[email protected]#ROOT2024 1:[email protected]#ROOT2024
+              PUNCH   - [alone] 0:[email protected]#ROOT2024
+              LITERAL Integer 1 0:[email protected]#ROOT2024
+
+            -1"#]],
+    );
+    check(
+        "-2",
+        expect![[r#"
+            SUBTREE $$ 1:[email protected]#ROOT2024 1:[email protected]#ROOT2024
+              PUNCH   - [alone] 0:[email protected]#ROOT2024
+              LITERAL Integer 2 0:[email protected]#ROOT2024
+
+            -2"#]],
+    );
+    check(
+        "- 2",
+        expect![[r#"
+            SUBTREE $$ 1:[email protected]#ROOT2024 1:[email protected]#ROOT2024
+              PUNCH   - [alone] 0:[email protected]#ROOT2024
+              LITERAL Integer 2 0:[email protected]#ROOT2024
+
+            -2"#]],
+    );
+    check(
+        "-3.0",
+        expect![[r#"
+            SUBTREE $$ 1:[email protected]#ROOT2024 1:[email protected]#ROOT2024
+              PUNCH   - [alone] 0:[email protected]#ROOT2024
+              LITERAL Float 3.0 0:[email protected]#ROOT2024
+
+            -3.0"#]],
+    );
+    check(
+        "- 3.0",
+        expect![[r#"
+            SUBTREE $$ 1:[email protected]#ROOT2024 1:[email protected]#ROOT2024
+              PUNCH   - [alone] 0:[email protected]#ROOT2024
+              LITERAL Float 3.0 0:[email protected]#ROOT2024
+
+            -3.0"#]],
+    );
+    check(
+        "@1",
+        expect![[r#"
+            SUBTREE $$ 1:[email protected]#ROOT2024 1:[email protected]#ROOT2024
+              LITERAL Integer 1 1:[email protected]#ROOT2024
+
+            1"#]],
+    );
+    check(
+        "@-1",
+        expect![[r#"
+            SUBTREE $$ 1:[email protected]#ROOT2024 1:[email protected]#ROOT2024
+              PUNCH   - [alone] 1:[email protected]#ROOT2024
+              LITERAL Integer 1 1:[email protected]#ROOT2024
+
+            -1"#]],
+    );
+    check(
+        "@1.0",
+        expect![[r#"
+            SUBTREE $$ 1:[email protected]#ROOT2024 1:[email protected]#ROOT2024
+              LITERAL Float 1.0 1:[email protected]#ROOT2024
+
+            1.0"#]],
+    );
+    check(
+        "@-1.0",
+        expect![[r#"
+            SUBTREE $$ 1:[email protected]#ROOT2024 1:[email protected]#ROOT2024
+              PUNCH   - [alone] 1:[email protected]#ROOT2024
+              LITERAL Float 1.0 1:[email protected]#ROOT2024
+
+            -1.0"#]],
+    );
+    check(
+        "@--1.0",
+        expect![[r#"
+            ExpandError {
+                inner: (
+                    1:[email protected]#ROOT2024,
+                    BindingError(
+                        "expected literal",
+                    ),
+                ),
+            }
+
+            SUBTREE $$ 1:[email protected]#ROOT2024 1:[email protected]#ROOT2024
+              PUNCH   - [joint] 1:[email protected]#ROOT2024
+              PUNCH   - [alone] 1:[email protected]#ROOT2024
+
+            --"#]],
+    );
+}