Add test case for more complicated recursive function calls.

testdata/scad/features/function-recursion-tests.scad

@@ -0,0 +1,12 @@
+function f() = f() + f();
+function g() = g(g());
+
+module m(x) {
+	cube(x);
+}
+
+echo(f());
+
+m(g());
+
+translate([20, 20, 0]) m(10);

tests/CMakeLists.txt

@@ -805,6 +805,7 @@ file(GLOB EXAMPLE_FILES ${CMAKE_SOURCE_DIR}/../examples/*.scad)
 
 list(APPEND ECHO_FILES ${FUNCTION_FILES}
             ${CMAKE_SOURCE_DIR}/../testdata/scad/features/for-tests.scad
+            ${CMAKE_SOURCE_DIR}/../testdata/scad/features/function-recursion-tests.scad
             ${CMAKE_SOURCE_DIR}/../testdata/scad/misc/echo-tests.scad
             ${CMAKE_SOURCE_DIR}/../testdata/scad/misc/escape-test.scad
             ${CMAKE_SOURCE_DIR}/../testdata/scad/misc/parser-tests.scad

tests/regression/dumptest/function-recursion-tests-expected.csg

@@ -0,0 +1,7 @@
+group() {
+	multmatrix([[1, 0, 0, 20], [0, 1, 0, 20], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+		group() {
+			cube(size = [10, 10, 10], center = false);
+		}
+	}
+}

tests/regression/echotest/function-recursion-tests-expected.echo

@@ -0,0 +1,4 @@
+ERROR: Recursion detected calling function 'f'
+ERROR: Function recursion caught while instantiating module 'echo'
+ERROR: Recursion detected calling function 'g'
+ERROR: Function recursion caught while instantiating module 'm'

tests/regression/echotest/recursion-tests-expected.echo

@@ -1,2 +1,2 @@
 ERROR: Recursion detected calling function 'crash'
-ECHO: undef
+ERROR: Function recursion caught while instantiating module 'echo'