disallow recursive module dependencies

tests/modules/trecinca.nim

@@ -1,7 +1,7 @@
 discard """
-  file: "tests/reject/trecincb.nim"
+  file: "trecincb.nim"
   line: 9
-  errormsg: "recursive dependency: 'tests/modules/trecincb.nim'"
+  errormsg: "recursive dependency: 'trecincb.nim'"
 """
 # Test recursive includes
 

tests/modules/trecincb.nim

@@ -1,7 +1,7 @@
 discard """
   file: "trecincb.nim"
   line: 9
-  errormsg: "recursive dependency: 'tests/modules/trecincb.nim'"
+  errormsg: "recursive dependency: 'trecincb.nim'"
 """
 # Test recursive includes
 

tests/modules/trecmod.nim

@@ -1,2 +1,7 @@
+discard """
+  file: "mrecmod.nim"
+  line: 1
+  errormsg: "recursive module dependency detected"
+"""
 # recursive module
 import mrecmod

tests/modules/trecmod2.nim

@@ -1,3 +1,8 @@
+discard """
+  file: "mrecmod2.nim"
+  line: 2
+  errormsg: "recursive module dependency detected"
+"""
 type
   T1* = int  # Module A exports the type ``T1``
 

tests/modules/tselfimport.nim

@@ -1,7 +1,7 @@
 discard """
   file: "tselfimport.nim"
   line: 7
-  errormsg: "A module cannot import itself"
+  errormsg: "recursive module dependency detected"
 """
 import strutils as su # guard against regression
 import tselfimport #ERROR