test: cover method text concatenation

docs/CURRENT_STATUS.md

@@ -63,6 +63,7 @@ Still needed:
 - The expression checker now carries a known TEXT operand through all arithmetic operators so object-field and typed-function-return diagnostics do not hide addition, subtraction, multiplication, or division mistakes; focused numeric-subtraction, numeric-division, and numeric-multiplication positives plus text-operand addition, subtraction, multiplication, and division negatives protect this behavior. Typed-function return diagnostics now have focused subtraction and division positives alongside multiplication coverage. Text concatenation into a TEXT field has focused positive fixtures for both operand orders, including concatenation of two TEXT object fields. Each numeric operator names the text operand and explains that it needs NUMBER values.
 - Method return validation now has focused positive subtraction and division fixtures alongside the existing arithmetic return coverage, including compatibility `TAKES` / `LEARNED` subtraction and division cases, so checked NUMBER method parameters and numeric subtraction or division remain accepted by the release validator in both method spellings.
 - Compatibility `TAKES` / `LEARNED` methods also have positive NUMBER, TEXT, and YESNO field-assignment coverage, and modern plus compatibility method-body `CHECK TYPE` metadata now have positive YESNO coverage beside the wrong-value diagnostics.
+- Modern method-body TEXT concatenation has positive coverage in both operand orders, such as `SET first first + "!"` and `SET last "Dr. " + last`.
 - richer typed function signatures and return values beyond the focused simple function/method `RETURNS TYPE` check
 - type checking through branches and loops
 - richer object field type checking beyond simple direct assignments

docs/ROADMAP.md

@@ -44,7 +44,8 @@ See `CURRENT_STATUS.md` for the detailed feature matrix.
 Keep declared return types honest: `claro typecheck` now reports friendly diagnostics for unknown declared return types, mismatched, not-yet-inferable, and empty return expressions, declarations with no `RETURN`, and incomplete conditional branches, when a simple function or object method declares `RETURNS TYPE`; the declaration keyword is case-insensitive like other Claro keywords, with positive coverage in modern and compatibility function forms, including lowercase compatibility declarations and lowercase compatibility method declarations, plus a lowercase compatibility-method mismatch fixture. Complete `IF`/`ELSE` return branches, including nested complete conditionals in functions and methods, are accepted, and modern and compatibility function syntax plus compatibility method syntax are covered by focused fixtures. `CHECK TYPE` parameter metadata also informs arithmetic return-expression checking, including object methods; positive numeric multiplication return coverage now sits beside the mismatch fixtures, including a dedicated compatibility-method multiplication success fixture; typed methods can also return class-declared fields by simple name, with positive and mismatch fixtures in both modern and compatibility method syntax, and unknown method return expressions now have dedicated modern and compatibility diagnostic fixtures, and NUMBER return expressions with known TEXT arithmetic operands identify the operation and offending operand, including focused addition, subtraction, multiplication, and division coverage for functions and methods. Compatibility method subtraction diagnostics are also covered alongside the existing addition diagnostic. Full path-sensitive analysis across nested conditionals and loops remains planned.
 
 7. Keep method-body field diagnostics learner-facing: typed methods now name the class method when a simple class field receives a known mismatch in `CHECK TYPE` or assignment, or a known TEXT operand in a NUMBER expression, with matching text and numeric coverage in modern and compatibility method syntax; direct assignments to undeclared method fields now report the missing field when the value type is known, and bare `CHECK TYPE missing IS TYPE` statements inside methods now use the expected type in the repair hint in both modern and compatibility method syntax; broader control-flow and object-flow analysis remains planned.
-8. Keep method-body coverage balanced across beginner field types and syntax generations: YESNO field assignment mismatches are now validated for both modern `DO` and compatibility `CALL ... WITH` method syntax, method-body `CHECK TYPE` metadata mismatches now have matching compatibility `TAKES` / `LEARNED` coverage alongside the modern form, compatibility YESNO field metadata has dedicated positive and negative fixtures, and compatibility method assignments to undeclared fields have the same focused missing-field diagnostic as modern methods, including a beginner-facing fallback when the assigned expression is not inferable yet.
+8: Keep method-body coverage balanced across beginner field types and syntax generations: YESNO field assignment mismatches are now validated for both modern `DO` and compatibility `CALL ... WITH` method syntax, method-body `CHECK TYPE` metadata mismatches now have matching compatibility `TAKES` / `LEARNED` coverage alongside the modern form, compatibility YESNO field metadata has dedicated positive and negative fixtures, and compatibility method assignments to undeclared fields have the same focused missing-field diagnostic as modern methods, including a beginner-facing fallback when the assigned expression is not inferable yet.
+8a. Keep method-body text expressions balanced: modern TEXT field concatenation is covered when the field is on either side of `+`, so both common beginner word-order patterns remain accepted.
 
 ### 1. Strong static types
 

tests/test_validate_typecheck_diagnostics.py

@@ -192,6 +192,12 @@ class ValidateTypecheckDiagnosticsTests(unittest.TestCase):
             MODULE.EXPECTED_OK,
         )
 
+    def test_includes_method_text_concatenation_success_fixture(self):
+        self.assertIn(
+            "tests/typecheck_method_text_concat_good.claro",
+            MODULE.EXPECTED_OK,
+        )
+
     def test_includes_yesno_method_field_assignment_diagnostics(self):
         self.assertIn(
             "tests/typecheck_method_yesno_field_assignment_bad.claro",

tests/typecheck_method_text_concat_good.claro

@@ -0,0 +1,12 @@
+CLASS Player
+    HAS first TEXT
+    HAS last TEXT
+
+    TEACH full_name
+        SET first first + "!"
+        SET last "Dr. " + last
+    END
+END
+
+NEW Player player
+DO player.full_name

tools/validate_typecheck_diagnostics.py

@@ -349,6 +349,7 @@ EXPECTED_OK = [
     "tests/typecheck_method_compat_text_field_assignment_good.claro",
     "tests/typecheck_method_compat_yesno_field_assignment_good.claro",
     "tests/typecheck_method_compat_field_assignment_good.claro",
+    "tests/typecheck_method_text_concat_good.claro",
     "tests/typecheck_method_field_check_type_good.claro",
     "tests/typecheck_method_compat_field_check_type_good.claro",
     "tests/typecheck_method_compat_yesno_field_check_type_good.claro",