iter ctt.1: env-overlay shape ratification + DuplicateCtor pin

2026-05-12 22:07:39 +02:00
parent 0a36294e61
commit 805bba3fda
6 changed files with 169 additions and 4 deletions
@@ -0,0 +1,72 @@
+//! Pin for `CheckError::DuplicateCtor` — same-named ctors in two
+//! different ADTs within one module. Ratifies the load-bearing
+//! consumer of the per-module `env.ctor_index` rebuild in
+//! `check_in_workspace` that DESIGN.md §"Env construction" rests
+//! on as the asymmetry-with-mono-side argument. If the
+//! per-module rebuild is ever removed without an equivalent
+//! replacement path, this test goes red.
+
+use ailang_check::check_workspace;
+use ailang_core::ast::{Ctor, Def, Module, TypeDef};
+use ailang_core::workspace::{Registry, Workspace};
+use ailang_core::SCHEMA;
+use std::collections::BTreeMap;
+
+#[test]
+fn duplicate_ctor_across_two_adts_in_one_module() {
+    let m = Module {
+        schema: SCHEMA.into(),
+        name: "M".into(),
+        imports: vec![],
+        defs: vec![
+            Def::Type(TypeDef {
+                name: "Cat".into(),
+                vars: vec![],
+                ctors: vec![Ctor {
+                    name: "Twins".into(),
+                    fields: vec![],
+                }],
+                doc: None,
+                drop_iterative: false,
+            }),
+            Def::Type(TypeDef {
+                name: "Dog".into(),
+                vars: vec![],
+                ctors: vec![Ctor {
+                    name: "Twins".into(),
+                    fields: vec![],
+                }],
+                doc: None,
+                drop_iterative: false,
+            }),
+        ],
+    };
+    let mut modules = BTreeMap::new();
+    modules.insert(m.name.clone(), m.clone());
+    let ws = Workspace {
+        entry: m.name.clone(),
+        modules,
+        root_dir: std::path::PathBuf::from("."),
+        registry: Registry::default(),
+    };
+
+    let diags = check_workspace(&ws);
+    let dup = diags
+        .iter()
+        .find(|d| d.code == "duplicate-ctor")
+        .unwrap_or_else(|| {
+            panic!(
+                "expected at least one `duplicate-ctor` diagnostic, got: {diags:?}"
+            )
+        });
+    assert!(
+        dup.message.contains("Twins"),
+        "expected message to name the duplicate ctor `Twins`, got: {}",
+        dup.message
+    );
+    assert!(
+        dup.message.contains("Cat") && dup.message.contains("Dog"),
+        "expected message to name both ADTs `Cat` and `Dog`, got: {}",
+        dup.message
+    );
+}