typecheck: validate missing method args

README.md

@@ -177,6 +177,7 @@ DO player.add "five"
 
 ```text
 Type mismatch for method Player.add: parameter points needs NUMBER, but this argument looks like TEXT.
+Method Player.add needs argument points as NUMBER, but this call does not provide it.
 ```
 
 If a learner calls a simple object method before creating the object with `NEW`, `claro typecheck` now points to the missing setup instead of letting the dotted call look like an ordinary unknown function. This covers both the modern `DO player.add 5` form and the older compatibility `CALL player.add WITH 5` form, including `CALL` mistakes where the method name itself is wrong:

docs/ADVANCED_STATIC_TYPING.md

@@ -140,7 +140,19 @@ Output:
 Type mismatch for method Player.add: parameter points needs NUMBER, but this argument looks like TEXT.
 ```
 
-Both sides of this narrow method foundation are covered by validation: `tests/typecheck_method_good.claro` checks that `DO player.add 5` is accepted, and `tests/typecheck_method_bad.claro` checks the friendly wrong-type diagnostic.
+If the learner forgets a checked method argument, `claro typecheck` also names the missing method parameter and expected type:
+
+```claro
+DO player.add
+```
+
+Output:
+
+```text
+Method Player.add needs argument points as NUMBER, but this call does not provide it.
+```
+
+Both sides of this narrow method foundation are covered by validation: `tests/typecheck_method_good.claro` checks that `DO player.add 5` is accepted, `tests/typecheck_method_bad.claro` checks the friendly wrong-type diagnostic, and `tests/typecheck_method_missing_arg_bad.claro` checks the missing checked-argument diagnostic.
 
 If the method call comes before the object is created, the type checker now gives the learner the missing setup step. The modern `DO` form and the older compatibility `CALL ... WITH` form both get this guidance, even when the method name is also a typo:
 

docs/CURRENT_STATUS.md

@@ -52,7 +52,7 @@ Ready now:
 - typed variables such as `SET score NUMBER 10`
 - `TYPE OF` and `CHECK TYPE`
 - typed list/map checks through `claro typecheck`
-- a narrow function/method argument check: `CHECK TYPE parameter IS TYPE` inside a function or simple object method lets `claro typecheck` accept correct checked calls, catch mismatched `DO`, `CALL ... WITH`, and `DO object.method ...` arguments, report missing checked function arguments, explain when `DO object.method ...` or compatibility `CALL object.method WITH ...` happens before the object is created with `NEW` even if the method name is also wrong, and catch simple calls to undeclared methods with a class-specific `TEACH` hint
+- a narrow function/method argument check: `CHECK TYPE parameter IS TYPE` inside a function or simple object method lets `claro typecheck` accept correct checked calls, catch mismatched `DO`, `CALL ... WITH`, and `DO object.method ...` arguments, report missing checked function and method arguments, explain when `DO object.method ...` or compatibility `CALL object.method WITH ...` happens before the object is created with `NEW` even if the method name is also wrong, and catch simple calls to undeclared methods with a class-specific `TEACH` hint
 - a narrow object-field assignment/check-type check for simple `NEW Class object` plus direct `SET object.field value` and `CHECK TYPE object.field IS TYPE` cases when the class declares `HAS field TYPE`; validation now covers correct NUMBER, TEXT, and YESNO direct assignments, direct `CHECK TYPE` metadata acceptance for NUMBER/TEXT/YESNO fields, negative NUMBER/TEXT/YESNO field `CHECK TYPE` metadata mismatches, NUMBER/TEXT/YESNO-expectation unknown-field `CHECK TYPE` diagnostics, missing-object field assignment and `CHECK TYPE` diagnostics, NUMBER/TEXT/YESNO wrong-type diagnostics, NUMBER/TEXT/YESNO-valued unknown-field diagnostics for direct assignments to undeclared fields, plus a plain beginner-facing unknown-field diagnostic when the assigned expression type is not inferable yet
 
 Still needed:

docs/ROADMAP.md

@@ -31,7 +31,7 @@ See `CURRENT_STATUS.md` for the detailed feature matrix.
 
 1. Keep beginner-facing docs current and separate from historical release notes.
 2. Keep examples aligned with the modern simple syntax (`END`, `DO`, short `SET`, short `ASK`) while documenting older compatibility forms separately.
-3. Expand validation around typecheck diagnostics and package/networking safety. Current Forgejo/Gitea CI runs the documented release gates (`claro validate`, typecheck diagnostics validation, version convention validation, and CI workflow coverage validation). Current package safety validation covers safe manifest/lockfile creation, rejecting unsafe package names during `package add`, detecting unsafe package names already present in `claro.project` during `package doctor`, and refusing to write lockfile data for unsafe package names during `package lock`. Current function validation covers correct checked calls, wrong-type arguments, and a missing checked-argument diagnostic; current object-method parameter validation covers one correct `DO object.method ...` call, one wrong-type diagnostic, missing-object guidance when `DO player.method ...` or compatibility `CALL object.method WITH ...` appears before `NEW` even if the method name is also wrong, and a class-specific unknown-method diagnostic when a learner calls a method the class does not declare; object-field validation covers correct NUMBER, TEXT, and YESNO direct `SET object.field value` assignments, direct `CHECK TYPE` metadata acceptance for NUMBER/TEXT/YESNO fields, negative NUMBER/TEXT/YESNO metadata mismatches, NUMBER/TEXT/YESNO-expectation unknown-field `CHECK TYPE` diagnostics, missing-object field assignment and `CHECK TYPE` diagnostics, NUMBER/TEXT/YESNO wrong-type direct assignments, simple NUMBER/TEXT/YESNO-valued unknown-field diagnostics after `NEW Class object`, and a beginner-facing fallback when the unknown field's assigned expression type is not inferable yet.
+3. Expand validation around typecheck diagnostics and package/networking safety. Current Forgejo/Gitea CI runs the documented release gates (`claro validate`, typecheck diagnostics validation, version convention validation, and CI workflow coverage validation). Current package safety validation covers safe manifest/lockfile creation, rejecting unsafe package names during `package add`, detecting unsafe package names already present in `claro.project` during `package doctor`, and refusing to write lockfile data for unsafe package names during `package lock`. Current function validation covers correct checked calls, wrong-type arguments, and a missing checked-argument diagnostic; current object-method parameter validation covers one correct `DO object.method ...` call, one wrong-type diagnostic, a missing checked-argument diagnostic, missing-object guidance when `DO player.method ...` or compatibility `CALL object.method WITH ...` appears before `NEW` even if the method name is also wrong, and a class-specific unknown-method diagnostic when a learner calls a method the class does not declare; object-field validation covers correct NUMBER, TEXT, and YESNO direct `SET object.field value` assignments, direct `CHECK TYPE` metadata acceptance for NUMBER/TEXT/YESNO fields, negative NUMBER/TEXT/YESNO metadata mismatches, NUMBER/TEXT/YESNO-expectation unknown-field `CHECK TYPE` diagnostics, missing-object field assignment and `CHECK TYPE` diagnostics, NUMBER/TEXT/YESNO wrong-type direct assignments, simple NUMBER/TEXT/YESNO-valued unknown-field diagnostics after `NEW Class object`, and a beginner-facing fallback when the unknown field's assigned expression type is not inferable yet.
 4. Add small examples for each foundation feature before adding bigger syntax.
 
 ## Complete-platform milestones

tests/typecheck_method_missing_arg_bad.claro

@@ -0,0 +1,11 @@
+CLASS Player
+    HAS score NUMBER
+
+    TEACH add points
+        CHECK TYPE points IS NUMBER
+        SET score score + points
+    END
+END
+
+NEW Player player
+DO player.add

tools/validate_typecheck_diagnostics.py

@@ -29,6 +29,9 @@ EXPECTED = {
     "tests/typecheck_method_bad.claro": [
         "tests/typecheck_method_bad.claro:11: Type mismatch for method Player.add: parameter points needs NUMBER, but this argument looks like TEXT.",
     ],
+    "tests/typecheck_method_missing_arg_bad.claro": [
+        "tests/typecheck_method_missing_arg_bad.claro:11: Method Player.add needs argument points as NUMBER, but this call does not provide it.",
+    ],
     "tests/typecheck_method_unknown_object_bad.claro": [
         "tests/typecheck_method_unknown_object_bad.claro:10: Object player is not known yet. Create it with NEW ClassName player before calling player.add.",
     ],