feat(types): support implicit single-argument constructors

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

4 files changed, 72 insertions, 0 deletions

diff --git a/tests/i/implicit-constructors/case.json b/tests/i/implicit-constructors/case.json
new file mode 100644
index 0000000..0967ef4
--- /dev/null
+++ b/tests/i/implicit-constructors/case.json
@@ -0,0 +1 @@
+{}
diff --git a/tests/i/implicit-constructors/expected.txt b/tests/i/implicit-constructors/expected.txt
new file mode 100644
index 0000000..d360ce8
--- /dev/null
+++ b/tests/i/implicit-constructors/expected.txt
@@ -0,0 +1,5 @@
+7:8:201:6:9
+9
+TRUE
+0
+0
diff --git a/tests/i/implicit-constructors/notes.md b/tests/i/implicit-constructors/notes.md
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index 0000000..cdcab87
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+++ b/tests/i/implicit-constructors/notes.md
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+# Implicit constructors
+
+Pending human review. Box counts constructions, copies and destruction. Assignments, BYVAL arguments, RETURN, operators and CASE use its INTEGER conversion. Pick selects its exact INTEGER overload. Exercise releases all objects; a later failing argument releases the pending converted Box before CATCH.
diff --git a/tests/i/implicit-constructors/program.cps b/tests/i/implicit-constructors/program.cps
new file mode 100644
index 0000000..d13236e
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+++ b/tests/i/implicit-constructors/program.cps
@@ -0,0 +1,63 @@
+GLOBAL
+    DECLARE Alive : INTEGER
+ENDGLOBAL
+CLASS Box
+    Value : INTEGER
+    OVERLOAD PROCEDURE NEW()
+        Alive <- Alive + 1
+    ENDPROCEDURE
+    OVERLOAD IMPLICIT PROCEDURE NEW(Number : INTEGER)
+        Value <- Number
+        Alive <- Alive + 1
+    ENDPROCEDURE
+    OVERLOAD PROCEDURE NEW(BYREF Other : Box)
+        Value <- Other.Value
+        Alive <- Alive + 1
+    ENDPROCEDURE
+    PROCEDURE DELETE()
+        Alive <- Alive - 1
+    ENDPROCEDURE
+ENDCLASS
+FUNCTION Read(Value : Box) RETURNS INTEGER
+    RETURN Value.Value
+ENDFUNCTION
+OVERLOAD FUNCTION Pick(Value : Box) RETURNS INTEGER
+    RETURN 100 + Value.Value
+ENDFUNCTION
+OVERLOAD FUNCTION Pick(Value : INTEGER) RETURNS INTEGER
+    RETURN 200 + Value
+ENDFUNCTION
+OVERLOAD FUNCTION Only(Value : Box) RETURNS INTEGER
+    RETURN Value.Value
+ENDFUNCTION
+OVERLOAD FUNCTION OPERATOR+(A : Box, B : Box) RETURNS INTEGER
+    RETURN A.Value + B.Value
+ENDFUNCTION
+OVERLOAD FUNCTION OPERATOR=(A : Box, B : Box) RETURNS BOOLEAN
+    RETURN A.Value = B.Value
+ENDFUNCTION
+FUNCTION Make() RETURNS Box
+    RETURN 9
+ENDFUNCTION
+PROCEDURE Exercise()
+    DECLARE B : Box
+    B <- 7
+    OUTPUT B.Value, ":", Read(8), ":", Pick(1), ":", Only(6), ":", B + 2
+    OUTPUT Read(Make())
+    CASE OF B
+        7 : OUTPUT TRUE
+        OTHERWISE : OUTPUT FALSE
+    ENDCASE
+ENDPROCEDURE
+FUNCTION Fail() RETURNS INTEGER
+    THROW
+ENDFUNCTION
+PROCEDURE Pair(Value : Box, Number : INTEGER)
+ENDPROCEDURE
+CALL Exercise()
+OUTPUT Alive
+TRY
+    CALL Pair(1, Fail())
+CATCH
+    OUTPUT Alive
+ENDTRY