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+//: Spaces help isolate recipes from each other. You can create them at will,
+//: and all addresses in arguments are implicitly based on the 'default-space'
+//: (unless they have the /raw property)
+
+:(scenario set_default_space)
+# if default-space is 10, and if an array of 5 locals lies from location 11 to 15 (inclusive),
+# then location 0 is really location 11, location 1 is really location 12, and so on.
+recipe main [
+  10:number <- copy 5:literal  # pretend array; in practice we'll use new
+  default-space:address:array:location <- copy 10:literal
+  1:number <- copy 23:literal
+]
++mem: storing 23 in location 12
+
+:(scenario deref_sidesteps_default_space)
+recipe main [
+  # pretend pointer from outside
+  3:number <- copy 34:literal
+  # pretend array
+  1000:number <- copy 5:literal
+  # actual start of this recipe
+  default-space:address:array:location <- copy 1000:literal
+  1:address:number <- copy 3:literal
+  8:number/raw <- copy 1:address:number/deref
+]
++mem: storing 34 in location 8
+
+//:: first disable name conversion for 'default-space'
+:(scenario convert_names_passes_default_space)
+recipe main [
+  default-space:number, x:number <- copy 0:literal, 1:literal
+]
++name: assign x 1
+-name: assign default-space 1
+
+:(before "End Disqualified Reagents")
+if (x.name == "default-space")
+  x.initialized = true;
+:(before "End is_special_name Cases")
+if (s == "default-space") return true;
+
+//:: now implement space support
+:(before "End call Fields")
+long long int default_space;
+:(before "End call Constructor")
+default_space = 0;
+
+:(replace "reagent r = x" following "reagent canonize(reagent x)")
+reagent r = absolutize(x);
+:(code)
+reagent absolutize(reagent x) {
+//?   if (Recipe_ordinal.find("increment-counter") != Recipe_ordinal.end()) //? 1
+//?     cout << "AAA " << "increment-counter/2: " << Recipe[Recipe_ordinal["increment-counter"]].steps.at(2).products.at(0).to_string() << '\n'; //? 1
+//?   cout << "absolutize " << x.to_string() << '\n'; //? 4
+//?   cout << is_raw(x) << '\n'; //? 1
+  if (is_raw(x) || is_dummy(x)) return x;
+//?   cout << "not raw: " << x.to_string() << '\n'; //? 1
+  if (!x.initialized)
+    raise << current_instruction().to_string() << ": reagent not initialized: " << x.to_string() << die();
+  reagent r = x;
+  r.set_value(address(r.value, space_base(r)));
+//?   cout << "after absolutize: " << r.value << '\n'; //? 1
+  r.properties.push_back(pair<string, vector<string> >("raw", vector<string>()));
+  assert(is_raw(r));
+  return r;
+}
+:(before "return result" following "reagent deref(reagent x)")
+result.properties.push_back(pair<string, vector<string> >("raw", vector<string>()));
+
+//:: fix 'get'
+
+:(scenario deref_sidesteps_default_space_in_get)
+recipe main [
+  # pretend pointer to container from outside
+  12:number <- copy 34:literal
+  13:number <- copy 35:literal
+  # pretend array
+  1000:number <- copy 5:literal
+  # actual start of this recipe
+  default-space:address:array:location <- copy 1000:literal
+  1:address:point <- copy 12:literal
+  9:number/raw <- get 1:address:point/deref, 1:offset
+]
++mem: storing 35 in location 9
+
+:(after "reagent tmp" following "case GET:")
+tmp.properties.push_back(pair<string, vector<string> >("raw", vector<string>()));
+
+//:: fix 'index'
+
+:(scenario deref_sidesteps_default_space_in_index)
+recipe main [
+  # pretend pointer to array from outside
+  12:number <- copy 2:literal
+  13:number <- copy 34:literal
+  14:number <- copy 35:literal
+  # pretend array
+  1000:number <- copy 5:literal
+  # actual start of this recipe
+  default-space:address:array:location <- copy 1000:literal
+  1:address:array:number <- copy 12:literal
+  9:number/raw <- index 1:address:array:number/deref, 1:literal
+]
++mem: storing 35 in location 9
+
+:(after "reagent tmp" following "case INDEX:")
+tmp.properties.push_back(pair<string, vector<string> >("raw", vector<string>()));
+
+//:: helpers
+
+:(code)
+long long int space_base(const reagent& x) {
+  return Current_routine->calls.front().default_space;
+}
+
+long long int address(long long int offset, long long int base) {
+  if (base == 0) return offset;  // raw
+//?   cout << base << '\n'; //? 2
+  if (offset >= static_cast<long long int>(Memory[base])) {
+    // todo: test
+    raise << "location " << offset << " is out of bounds " << Memory[base] << " at " << base << '\n';
+  }
+  return base+1 + offset;
+}
+
+:(after "void write_memory(reagent x, vector<double> data)")
+  if (x.name == "default-space") {
+    assert(scalar(data));
+    Current_routine->calls.front().default_space = data.at(0);
+//?     cout << "AAA " << Current_routine->calls.front().default_space << '\n'; //? 1
+    return;
+  }
+
+:(scenario get_default_space)
+recipe main [
+  default-space:address:array:location <- copy 10:literal
+  1:number/raw <- copy default-space:address:array:location
+]
++mem: storing 10 in location 1
+
+:(after "vector<double> read_memory(reagent x)")
+  if (x.name == "default-space") {
+    vector<double> result;
+    result.push_back(Current_routine->calls.front().default_space);
+    return result;
+  }