diff --git a/anselme/ast/ArgumentTuple.lua b/anselme/ast/ArgumentTuple.lua
index 66b7803..41219db 100644
--- a/anselme/ast/ArgumentTuple.lua
+++ b/anselme/ast/ArgumentTuple.lua
@@ -159,7 +159,7 @@ ArgumentTuple = ast.abstract.Node {
 			-- type check (assume ok for default values)
 			if param.type_check and arg ~= param.default then
 				local r = param.type_check:call(state, ArgumentTuple:new(arg))
-				if not r:truthy() then return false, ("type check failure for parameter %s in function %s"):format(param.identifier:format(state), params:format(state)) end
+				if not r:truthy() then return false, ("type check failure for parameter %s"):format(param.identifier:format(state)) end
 				if Number:is(r) then
 					specificity = specificity + r.number
 				else
diff --git a/anselme/ast/Environment.lua b/anselme/ast/Environment.lua
index ab8eacd..1a2b31f 100644
--- a/anselme/ast/Environment.lua
+++ b/anselme/ast/Environment.lua
@@ -19,6 +19,7 @@ local VariableMetadata = ast.abstract.Runtime {
 		if self.symbol.alias then
 			return v:call(state, ArgumentTuple:new())
 		else
+			v.from_symbol = self.symbol
 			return v
 		end
 	end,
@@ -31,11 +32,11 @@ local VariableMetadata = ast.abstract.Runtime {
 	end,
 	set = function(self, state, value)
 		if self.symbol.constant then
-			error(("trying to change the value of constant %s"):format(self.symbol.string), 0)
+			error(("trying to change the value of constant %s"):format(self.symbol.string:format(state)), 0)
 		end
 		if self.symbol.type_check then
 			local r = self.symbol.type_check:call(state, ArgumentTuple:new(value))
-			if not r:truthy() then error(("type check failure for %s; %s does not satisfy %s"):format(self.symbol.string, value, self.symbol.type_check), 0) end
+			if not r:truthy() then error(("type check failure for %s; %s does not satisfy %s"):format(self.symbol.string:format(state), value, self.symbol.type_check:format(state)), 0) end
 		end
 		if self.symbol.alias then
 			local assign_args = ArgumentTuple:new()
@@ -223,7 +224,9 @@ local Environment = ast.abstract.Runtime {
 		local e = self
 		while e.parent do
 			e = e.parent
-			d = d + 1
+			if not (e.partial or e.export) then -- only count full layers
+				d = d + 1
+			end
 		end
 		return d
 	end,
diff --git a/anselme/ast/Function.lua b/anselme/ast/Function.lua
index 77c3e4d..71e778b 100644
--- a/anselme/ast/Function.lua
+++ b/anselme/ast/Function.lua
@@ -39,9 +39,9 @@ Function = Overloadable {
 
 	_format = function(self, ...)
 		if self.parameters.assignment then
-			return "$"..self.parameters:format(...).."; "..self.expression:format_right(...)
+			return "$"..self.parameters:format_short(...).."; "..self.expression:format_right(...)
 		else
-			return "$"..self.parameters:format(...).." "..self.expression:format_right(...)
+			return "$"..self.parameters:format_short(...).." "..self.expression:format_right(...)
 		end
 	end,
 	_format_priority = function(self)
@@ -77,7 +77,7 @@ Function = Overloadable {
 		return args:match_parameter_tuple(state, self.parameters)
 	end,
 	format_signature = function(self, state)
-		return self.parameters:format(state)
+		return "$"..self.parameters:format_short(state)
 	end,
 	hash_signature = function(self)
 		return self.parameters:hash()
diff --git a/anselme/ast/LuaFunction.lua b/anselme/ast/LuaFunction.lua
index 820c489..5ee4046 100644
--- a/anselme/ast/LuaFunction.lua
+++ b/anselme/ast/LuaFunction.lua
@@ -41,7 +41,7 @@ LuaFunction = ast.abstract.Runtime(Overloadable) {
 		return args:match_parameter_tuple(state, self.parameters)
 	end,
 	format_signature = function(self, state)
-		return self.parameters:format(state)
+		return "$"..self.parameters:format_short(state)
 	end,
 	hash_signature = function(self)
 		return self.parameters:hash()
diff --git a/anselme/ast/Overload.lua b/anselme/ast/Overload.lua
index 6400e9d..400cd50 100644
--- a/anselme/ast/Overload.lua
+++ b/anselme/ast/Overload.lua
@@ -23,12 +23,12 @@ Overload = ast.abstract.Node {
 	end,
 
 	_format = function(self, ...)
-		local s = "overload<"
+		local s = "overload(["
 		for i, e in ipairs(self.list) do
 			s = s .. e:format(...)
 			if i < #self.list then s = s .. ", " end
 		end
-		return s..">"
+		return s.."])"
 	end,
 
 	traverse = function(self, fn, ...)
@@ -50,18 +50,18 @@ Overload = ast.abstract.Node {
 					if secondary_specificity > success_secondary_specificity then
 						success, success_specificity, success_secondary_specificity = fn, specificity, secondary_specificity
 					elseif secondary_specificity == success_secondary_specificity then
-						return nil, ("more than one function match %s, matching functions were at least (specificity %s.%s):\n\t• %s\n\t• %s"):format(args:format(state), specificity, secondary_specificity, fn:format_signature(state), success:format_signature(state))
+						return nil, ("more than one function match arguments %s, matching functions were at least (specificity %s.%s):\n\t• %s (from %s)\n\t• %s (from %s)"):format(args:format(state), specificity, secondary_specificity, fn:format_signature(state), fn.source, success:format_signature(state), success.source)
 					end
 				end
 				-- no need to add error message for less specific function since we already should have at least one success
 			elseif not success then
-				table.insert(failure, fn:format_signature(state) .. ": " .. secondary_specificity)
+				table.insert(failure, ("%s (from %s):\n\t\t%s"):format(fn:format_signature(state), fn.source, secondary_specificity))
 			end
 		end
 		if success then
 			return success, args
 		else
-			return nil, ("no function match %s, possible functions were:\n\t• %s"):format(args:format(state), table.concat(failure, "\n\t• "))
+			return nil, ("no function match arguments %s, possible functions were:\n\t• %s"):format(args:format(state), table.concat(failure, "\n\t• "))
 		end
 	end
 }
diff --git a/anselme/ast/Tuple.lua b/anselme/ast/Tuple.lua
index 87687b1..7d8448f 100644
--- a/anselme/ast/Tuple.lua
+++ b/anselme/ast/Tuple.lua
@@ -66,7 +66,7 @@ Tuple = ast.abstract.Node {
 		if index > #self.list or index == 0 then error("tuple index out of bounds", 0) end
 		self.list[index] = value
 	end,
-	len =  function(self)
+	len = function(self)
 		return #self.list
 	end,
 	iter = function(self)
diff --git a/anselme/ast/abstract/Node.lua b/anselme/ast/abstract/Node.lua
index 79dceeb..2d1e0e2 100644
--- a/anselme/ast/abstract/Node.lua
+++ b/anselme/ast/abstract/Node.lua
@@ -134,7 +134,7 @@ Node = class {
 	end,
 
 	-- generate a list of translatable nodes that appear in this node
-	-- should only be called on non-runtime nodes
+	-- should only be called on non-evaluated nodes
 	-- if a node is translatable, redefine this to add it to the table - note that it shouldn't call :traverse or :list_translatable on its children, as nested translations should not be needed
 	list_translatable = function(self, t)
 		t = t or {}
@@ -235,7 +235,7 @@ Node = class {
 		if dispatched then
 			return dispatched:call_dispatched(state, dispatched_arg)
 		else
-			error(("can't call %s %s: %s"):format(self.type, self:format(state), dispatched_arg), 0)
+			error(("can't call %s %s: %s"):format(self.type, self:format_short(state), dispatched_arg), 0)
 		end
 	end,
 	-- find a function that can be called with the given arguments
@@ -300,21 +300,26 @@ Node = class {
 	end,
 
 	-- return a pretty string representation of the node.
-	-- for non-runtime nodes (what was generated by a parse without any evaluation), this should return valid Anselme code that is functionnally equivalent to the parsed code. note that it currently does not preserve comment.
+	-- for non-evaluated nodes, this should return valid Anselme code that is functionnally equivalent to the parsed code. note that it currently does not preserve comment.
 	-- assuming nothing was mutated in the node, the returned string should remain the same - so if make sure the function is deterministic, e.g. sort if you use pairs()
 	-- redefine _format, not this - note that _format is a mandary method for all nodes.
-	-- state is optional and should only be relevant for runtime nodes; if specified, only show what is relevant for the current branch.
+	-- state is optional and should only have an effect on evaluated nodes; if specified, only show what is relevant for the current branch.
 	-- indentation_level and parent_priority are optional value that respectively keep track in nester :format calls of the indentation level (number) and parent operator priority (number); if the node has a strictly lower priority than the parent node, parentheses will be added
 	-- also remember that execution is done left-to-right, so in case of priority equality, all is fine if the term appear left of the operator, but parentheses will need to be added if the term is right of the operator - so make sure to call :format_right for such cases
+	-- short_mode, if set to true, will use the identifier the expression was last retrieved from instead of calling :_format. Should have no effect on non-evaluated nodes.
 	-- (:format is not cached as even immutable nodes may contain mutable children)
-	format = function(self, state, parent_priority, indentation_level)
+	format = function(self, state, parent_priority, indentation_level, short_mode, right)
 		indentation_level = indentation_level or 0
 		parent_priority = parent_priority or 0
 
-		local s = self:_format(state, self:format_priority(), indentation_level)
-
-		if self:format_priority() < parent_priority then
-			s = ("(%s)"):format(s)
+		local s
+		if short_mode and self.from_symbol then
+			s = self.from_symbol.string
+		else
+			s = self:_format(state, self:format_priority(), indentation_level, short_mode)
+			if self:format_priority() < parent_priority or (right and self:format_priority() <= parent_priority) then
+				s = ("(%s)"):format(s)
+			end
 		end
 
 		local indentation = ("\t"):rep(indentation_level)
@@ -323,23 +328,15 @@ Node = class {
 		return s
 	end,
 	-- same as :format, but should be called only for nodes right of the current operator
-	format_right = function(self, state, parent_priority, indentation_level)
-		indentation_level = indentation_level or 0
-		parent_priority = parent_priority or 0
-
-		local s = self:_format(state, self:format_priority(), indentation_level)
-
-		if self:format_priority() <= parent_priority then
-			s = ("(%s)"):format(s)
-		end
-
-		local indentation = (" "):rep(indentation_level)
-		s = indentation..s:gsub("\n", "\n"..indentation)
-
-		return s
+	format_right = function(self, state, parent_priority, indentation_level, short_mode)
+		return self:format(state, parent_priority, indentation_level, short_mode, true)
+	end,
+	-- same as :format, but enable short mode
+	format_short = function(self, state, parent_priority, indentation_level)
+		return self:format(state, parent_priority, indentation_level, true)
 	end,
 	-- redefine this to provide a custom :format. returns a string.
-	_format = function(self, state, self_priority, identation)
+	_format = function(self, state, self_priority, identation, short_mode)
 		error("format not implemented for "..self.type)
 	end,
 	-- compute the priority of the node that will be used in :format to add eventually needed parentheses.
@@ -356,6 +353,7 @@ Node = class {
 		return math.huge -- by default, assumes primary node, i.e. never wrap in parentheses
 	end,
 	_format_priority_cache = nil, -- cached priority
+	from_symbol = nil, -- last symbol this node was retrived from
 
 	-- return Lua value
 	-- this should probably be only called on a Node that is already evaluated
diff --git a/anselme/ast/abstract/Overloadable.lua b/anselme/ast/abstract/Overloadable.lua
index 7e0cf55..cdda730 100644
--- a/anselme/ast/abstract/Overloadable.lua
+++ b/anselme/ast/abstract/Overloadable.lua
@@ -12,11 +12,11 @@ return ast.abstract.Node {
 		error("not implemented for "..self.type)
 	end,
 
-	-- return string
+	-- return string, friendly representation of the function signature
 	format_signature = function(self, state)
 		error("not implemented for "..self.type)
 	end,
-	-- return string
+	-- return string, unique hash for this function signature
 	hash_signature = function(self)
 		error("not implemented for "..self.type)
 	end,
diff --git a/anselme/stdlib/function.lua b/anselme/stdlib/function.lua
index a8c9158..d35c8f6 100644
--- a/anselme/stdlib/function.lua
+++ b/anselme/stdlib/function.lua
@@ -1,5 +1,5 @@
 local ast = require("anselme.ast")
-local Nil, Boolean, Definition, Return = ast.Nil, ast.Boolean, ast.Definition, ast.Return
+local Nil, Boolean, Definition, Return, Overload, Overloadable = ast.Nil, ast.Boolean, ast.Definition, ast.Return, ast.Overload, ast.abstract.Overloadable
 local assert0 = require("anselme.common").assert0
 
 return {
@@ -17,7 +17,19 @@ return {
 	},
 
 	{
-		"_._", "(c::function, s::string)",
+		"overload", "(l::is sequence)",
+		function(state, l)
+			local r = Overload:new()
+			for _, fn in l:iter(state) do
+				assert0(Overloadable:issub(fn), ("trying to add a non overloadable %s to an overload"):format(fn:format(state)))
+				r:insert(fn)
+			end
+			return r
+		end
+	},
+
+	{
+		"_._", "(c::is function, s::is string)",
 		function(state, c, s)
 			local identifier = s:to_identifier()
 			assert0(c.scope:defined(state, identifier), ("no variable %q defined in closure"):format(s.string))
diff --git a/test/results/exported variable nested.ans b/test/results/exported variable nested.ans
index d355df6..8f7dcea 100644
--- a/test/results/exported variable nested.ans	
+++ b/test/results/exported variable nested.ans	
@@ -5,7 +5,7 @@
 --- text ---
 | {}"" {}"42" {}"" |
 --- error ---
-identifier "z" is undefined in branch 7dfcaa5b-2163-4f36-116ed-c4ab6bc8d28b
+identifier "z" is undefined in branch 46991f07-7340-4104-9f35-c1fb62e95088
 	↳ from test/tests/exported variable nested.ans:12:3 in identifier: z
 	↳ from test/tests/exported variable nested.ans:12:1 in text interpolation: | {z} |
 	↳ from ? in block: :f = ($() _)…
diff --git a/test/results/for invalid iterator.ans b/test/results/for invalid iterator.ans
index 23f29df..edf81d0 100644
--- a/test/results/for invalid iterator.ans	
+++ b/test/results/for invalid iterator.ans	
@@ -1,14 +1,18 @@
 --# run #--
 --- error ---
-can't call overload overload<($(table::($(x) <lua function>)) _), ($(tuple::($(x) type(x) == "tuple" | type(x) == "list")) _), ($(range::($(x) type(x) == t)) _), ($(s::($(x) <lua function>)) <lua function>)>: no function match (42), possible functions were:
-	• (table::($(x) <lua function>)): type check failure for parameter table in function (table::($(x) <lua function>))
-	• (tuple::($(x) type(x) == "tuple" | type(x) == "list")): type check failure for parameter tuple in function (tuple::($(x) type(x) == "tuple" | type(x) == "list"))
-	• (range::($(x) type(x) == t)): type check failure for parameter range in function (range::($(x) type(x) == t))
-	• (s::($(x) <lua function>)): type check failure for parameter s in function (s::($(x) <lua function>))
-	↳ from for.ans:3:18 in call: iter(var)
-	↳ from for.ans:3:12 in definition: :iterator = iter(var)
-	↳ from for.ans:2:1 in block: :iterator = iter(var)…
-	↳ from for.ans:2:68 in call: _
+can't call overload iter: no function match arguments (42), possible functions were:
+	• $(table::is table) (from stdlib/for.ans:46:1):
+		type check failure for parameter table
+	• $(tuple::is sequence) (from stdlib/for.ans:37:1):
+		type check failure for parameter tuple
+	• $(range::is range) (from stdlib/for.ans:19:1):
+		type check failure for parameter range
+	• $(s::is struct) (from stdlib/for.ans:3:14):
+		type check failure for parameter s
+	↳ from stdlib/for.ans:3:18 in call: iter(var)
+	↳ from stdlib/for.ans:3:12 in definition: :iterator = iter(var)
+	↳ from stdlib/for.ans:2:1 in block: :iterator = iter(var)…
+	↳ from stdlib/for.ans:2:71 in call: _
 	↳ from test/tests/for invalid iterator.ans:1:4 in call: for(:x, 42)
 	↳ from ? in block: for(:x, 42)…
 --# saved #--
diff --git a/test/results/function args arity check fail.ans b/test/results/function args arity check fail.ans
index dea819f..a559e70 100644
--- a/test/results/function args arity check fail.ans	
+++ b/test/results/function args arity check fail.ans	
@@ -1,6 +1,6 @@
 --# run #--
 --- error ---
-can't call function $(a, b) _: expected 2 arguments, received 1
+can't call function f: expected 2 arguments, received 1
 	↳ from test/tests/function args arity check fail.ans:4:2 in call: f("ok")
 	↳ from ? in block: :f = ($(a, b) _)…
 --# saved #--
diff --git a/test/results/function conflict.ans b/test/results/function conflict.ans
index 3b84880..b4bf4f2 100644
--- a/test/results/function conflict.ans	
+++ b/test/results/function conflict.ans	
@@ -1,6 +1,6 @@
 --# run #--
 --- error ---
-a function with parameters (a, b) is already defined in the overload
+a function with parameters $(a, b) is already defined in the overload
 	↳ from test/tests/function conflict.ans:5:1 in definition: :f = ($(a, b) 0)
 	↳ from ? in block: :f = ($(a, b) 0)…
 --# saved #--
diff --git a/test/results/function custom type dispatch error.ans b/test/results/function custom type dispatch error.ans
index 69da3e9..7124d50 100644
--- a/test/results/function custom type dispatch error.ans	
+++ b/test/results/function custom type dispatch error.ans	
@@ -4,9 +4,11 @@
 --- text ---
 | {}"" {}"idk" {}" is esperanto" |
 --- error ---
-can't call overload overload<($(name::($(x) type(x) == t)) _), ($(name::($(x) type(x) == t)) _)>: no function match (type(5, "nope")), possible functions were:
-	• (name::($(x) type(x) == t)): type check failure for parameter name in function (name::($(x) type(x) == t))
-	• (name::($(x) type(x) == t)): type check failure for parameter name in function (name::($(x) type(x) == t))
+can't call overload a: no function match arguments (type(5, "nope")), possible functions were:
+	• $(name::($(x) type(x) == t)) (from test/tests/function custom type dispatch error.ans:7:1):
+		type check failure for parameter name
+	• $(name::($(x) type(x) == t)) (from test/tests/function custom type dispatch error.ans:4:1):
+		type check failure for parameter name
 	↳ from test/tests/function custom type dispatch error.ans:14:2 in call: a(type(5, "nope"))
 	↳ from ? in block: :french name = "french name"…
 --# saved #--
diff --git a/test/results/function random.ans b/test/results/function random.ans
index 15a5220..7cc973b 100644
--- a/test/results/function random.ans	
+++ b/test/results/function random.ans	
@@ -2,14 +2,14 @@
 --- text ---
 | {}"a" |
 --- text ---
+| {}"b" |
+--- text ---
 | {}"c" |
 --- text ---
 | {}"a" |
 --- text ---
-| {}"a" |
---- text ---
-| {}"c" |
+| {}"b" |
 --- return ---
 ()
 --# saved #--
-{"a.checkpoint":false, "a.run":3, "c.checkpoint":false, "c.run":2}
\ No newline at end of file
+{"a.checkpoint":false, "a.run":2, "b.checkpoint":false, "b.run":2, "c.checkpoint":false, "c.run":1}
\ No newline at end of file
diff --git a/test/results/function scope wrong.ans b/test/results/function scope wrong.ans
index 7bfde1c..f716317 100644
--- a/test/results/function scope wrong.ans	
+++ b/test/results/function scope wrong.ans	
@@ -1,6 +1,6 @@
 --# run #--
 --- error ---
-identifier "b" is undefined in branch 7dfcaa5b-2163-4f36-116ed-c4ab6bc8d28b
+identifier "b" is undefined in branch 46991f07-7340-4104-9f35-c1fb62e95088
 	↳ from test/tests/function scope wrong.ans:4:7 in identifier: b
 	↳ from test/tests/function scope wrong.ans:4:1 in text interpolation: | a: {b} |
 	↳ from ? in block: :a = ($() _)…
diff --git a/test/results/function separate variable from variants.ans b/test/results/function separate variable from variants.ans
index 9b36243..a22c3bd 100644
--- a/test/results/function separate variable from variants.ans	
+++ b/test/results/function separate variable from variants.ans	
@@ -1,12 +1,18 @@
 --# run #--
 --- error ---
-can't call overload overload<($(s::($(x) type(x) == t), k::($(x) <lua function>)) = val; _), ($(s::($(x) type(x) == t), k::($(x) <lua function>)) = val; _), ($(s::($(x) type(x) == t), k::($(x) <lua function>)) _), ($(c::($(x) <lua function>), s::($(x) <lua function>)) = v; <lua function>), ($(c::($(x) <lua function>), s::($(x) <lua function>)) = v; <lua function>), ($(c::($(x) <lua function>), s::($(x) <lua function>)) <lua function>)>: no function match (overload<($(b) _), ($(x) _), ($() _)>, "a"), possible functions were:
-	• (s::($(x) type(x) == t), k::($(x) <lua function>)) = val: expected 3 arguments, received 2
-	• (s::($(x) type(x) == t), k::($(x) <lua function>)) = val: expected 3 arguments, received 2
-	• (s::($(x) type(x) == t), k::($(x) <lua function>)): type check failure for parameter s in function (s::($(x) type(x) == t), k::($(x) <lua function>))
-	• (c::($(x) <lua function>), s::($(x) <lua function>)) = v: expected 3 arguments, received 2
-	• (c::($(x) <lua function>), s::($(x) <lua function>)) = v: expected 3 arguments, received 2
-	• (c::($(x) <lua function>), s::($(x) <lua function>)): type check failure for parameter c in function (c::($(x) <lua function>), s::($(x) <lua function>))
+can't call overload _._: no function match arguments (overload([($(b) _), ($(x) _), ($() _)]), "a"), possible functions were:
+	• $(s::is script, k::is symbol) = val (from stdlib/script.ans:44:1):
+		expected 3 arguments, received 2
+	• $(s::is script, k::is string) = val (from stdlib/script.ans:42:1):
+		expected 3 arguments, received 2
+	• $(s::is script, k::is string) (from stdlib/script.ans:40:1):
+		type check failure for parameter s
+	• $(c::is function, s::is symbol) = v (from test/tests/function separate variable from variants.ans:10:4):
+		expected 3 arguments, received 2
+	• $(c::is function, s::is string) = v (from test/tests/function separate variable from variants.ans:10:4):
+		expected 3 arguments, received 2
+	• $(c::is function, s::is string) (from test/tests/function separate variable from variants.ans:10:4):
+		type check failure for parameter c
 	↳ from test/tests/function separate variable from variants.ans:10:4 in call: f . "a"
 	↳ from test/tests/function separate variable from variants.ans:10:1 in text interpolation: | {f . "a"} = 2 |
 	↳ from ? in block: :f = ($() _)…
diff --git a/test/results/function type dispatch ambigous.ans b/test/results/function type dispatch ambigous.ans
index 8d6a596..08cded7 100644
--- a/test/results/function type dispatch ambigous.ans	
+++ b/test/results/function type dispatch ambigous.ans	
@@ -1,9 +1,9 @@
 --# run #--
 --- error ---
-can't call overload overload<($(a::($(x) <lua function>)) _), ($(x::($(x) <lua function>)) _)>: more than one function match (5), matching functions were at least (specificity 1.3):
-	• (x::($(x) <lua function>))
-	• (a::($(x) <lua function>))
+can't call overload fn: more than one function match arguments (5), matching functions were at least (specificity 1.2):
+	• $(x::is number) (from test/tests/function type dispatch ambigous.ans:1:1)
+	• $(a::is number) (from test/tests/function type dispatch ambigous.ans:4:1)
 	↳ from test/tests/function type dispatch ambigous.ans:7:3 in call: fn(5)
-	↳ from ? in block: :fn = ($(x::number) _)…
+	↳ from ? in block: :fn = ($(x::is number) _)…
 --# saved #--
 {}
\ No newline at end of file
diff --git a/test/results/merge nested mutable error bis.ans b/test/results/merge nested mutable error bis.ans
index 6873006..2bbed04 100644
--- a/test/results/merge nested mutable error bis.ans	
+++ b/test/results/merge nested mutable error bis.ans	
@@ -4,14 +4,14 @@
 	↳ from test/tests/merge nested mutable error bis.ans:14:7 in call: error("abort")
 	↳ from test/tests/merge nested mutable error bis.ans:3:1 in block: insert(a, b)…
 	↳ from test/tests/merge nested mutable error bis.ans:3:18 in call: _
-	↳ from script.ans:30:6 in call: fn!
-	↳ from script.ans:28:3 in block: resume target = ()…
-	↳ from script.ans:28:7 in call: else!
-	↳ from script.ans:24:2 in block: if(fn . "current checkpoint")…
-	↳ from script.ans:24:9 in call: _
-	↳ from script.ans:38:9 in call: value(s)!
-	↳ from script.ans:37:1 in block: value(s)!
-	↳ from script.ans:37:20 in call: _
+	↳ from stdlib/script.ans:30:6 in call: fn!
+	↳ from stdlib/script.ans:28:3 in block: resume target = ()…
+	↳ from stdlib/script.ans:28:7 in call: else!
+	↳ from stdlib/script.ans:24:2 in block: if(fn . "current checkpoint")…
+	↳ from stdlib/script.ans:24:9 in call: _
+	↳ from stdlib/script.ans:38:9 in call: value(s)!
+	↳ from stdlib/script.ans:37:1 in block: value(s)!
+	↳ from stdlib/script.ans:37:20 in call: _
 	↳ from test/tests/merge nested mutable error bis.ans:19:2 in call: f!
 	↳ from ? in block: :a = *[1]…
 --# post run check #--
diff --git a/test/results/merge nested mutable error.ans b/test/results/merge nested mutable error.ans
index 7e3dbfd..467b0e0 100644
--- a/test/results/merge nested mutable error.ans	
+++ b/test/results/merge nested mutable error.ans	
@@ -4,14 +4,14 @@
 	↳ from test/tests/merge nested mutable error.ans:14:7 in call: error("abort")
 	↳ from test/tests/merge nested mutable error.ans:3:1 in block: insert(a, b)…
 	↳ from test/tests/merge nested mutable error.ans:3:18 in call: _
-	↳ from script.ans:30:6 in call: fn!
-	↳ from script.ans:28:3 in block: resume target = ()…
-	↳ from script.ans:28:7 in call: else!
-	↳ from script.ans:24:2 in block: if(fn . "current checkpoint")…
-	↳ from script.ans:24:9 in call: _
-	↳ from script.ans:38:9 in call: value(s)!
-	↳ from script.ans:37:1 in block: value(s)!
-	↳ from script.ans:37:20 in call: _
+	↳ from stdlib/script.ans:30:6 in call: fn!
+	↳ from stdlib/script.ans:28:3 in block: resume target = ()…
+	↳ from stdlib/script.ans:28:7 in call: else!
+	↳ from stdlib/script.ans:24:2 in block: if(fn . "current checkpoint")…
+	↳ from stdlib/script.ans:24:9 in call: _
+	↳ from stdlib/script.ans:38:9 in call: value(s)!
+	↳ from stdlib/script.ans:37:1 in block: value(s)!
+	↳ from stdlib/script.ans:37:20 in call: _
 	↳ from test/tests/merge nested mutable error.ans:19:2 in call: f!
 	↳ from ? in block: :a = *[1]…
 --# post run check #--