niti: make `catch_count` writable

[nit.git] / src / interpreter / naive_interpreter.nit

diff --git a/src/interpreter/naive_interpreter.nit b/src/interpreter/naive_interpreter.nit
index 66afa45..eced30f 100644 (file)
--- a/src/interpreter/naive_interpreter.nit
+++ b/src/interpreter/naive_interpreter.nit
@@ -119,7 +119,10 @@ class NaiveInterpreter
        var escapemark: nullable EscapeMark = null
 
        # The count of `catch` blocs that have been encountered and can catch an abort
-       var catch_count = 0
+       var catch_count = 0 is writable
+
+       # The last error thrown on abort/runtime error where catch_count > 0
+       var last_error: nullable FatalError = null
 
        # Is a return or a break or a continue executed?
        # Use this function to know if you must skip the evaluation of statements
@@ -685,6 +688,15 @@ class NaiveInterpreter
        var error_instance = new MutableInstance(modelbuilder.model.null_type) is lazy
 end
 
+# A runtime error
+class FatalError
+       # The error message
+       var message: String
+
+       # The problematic node, if any
+       var node: nullable ANode
+end
+
 # An instance represents a value of the executed program.
 abstract class Instance
        # The dynamic type of the instance
@@ -823,6 +835,7 @@ redef class ANode
        do
                # Abort if there is a `catch` block
                if v.catch_count > 0 then
+                       v.last_error = new FatalError(message, self)
                        abort
                end