diff --git a/anselme/state/ScopeStack.lua b/anselme/state/ScopeStack.lua
index bee26cd..d209f1f 100644
--- a/anselme/state/ScopeStack.lua
+++ b/anselme/state/ScopeStack.lua
@@ -65,7 +65,7 @@ local ScopeStack = class {
 				end
 			end
 			self:define_overloadable(sym, LuaFunction:new(parameters, func):eval(self.state))
-		elseif Node:is(value) then
+		elseif Node:issub(value) then
 			self:define(sym, value)
 		else
 			self:define(sym, to_anselme(value))
diff --git a/test/results/function custom type dispatch error.ans b/test/results/function custom type dispatch error.ans
new file mode 100644
index 0000000..0f10730
--- /dev/null
+++ b/test/results/function custom type dispatch error.ans	
@@ -0,0 +1,13 @@
+--# run #--
+--- text ---
+| {}"" {}"pierre" {}" is french" |
+--- text ---
+| {}"" {}"idk" {}" is esperanto" |
+--- error ---
+can't call overload overload<($(name::($(x) type(x) == t)) _), ($(name::($(x) type(x) == t)) _)>: no function match (type("nope", 5)), 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))
+	↳ 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 #--
+{}
\ No newline at end of file
diff --git a/test/results/function custom type dispatch.ans b/test/results/function custom type dispatch.ans
new file mode 100644
index 0000000..3a4a570
--- /dev/null
+++ b/test/results/function custom type dispatch.ans	
@@ -0,0 +1,11 @@
+--# run #--
+--- text ---
+| {}"" {}"bob" {}" is english or generic" |
+--- text ---
+| {}"" {}"pierre" {}" is french" |
+--- text ---
+| {}"" {}"idk" {}" is english or generic" |
+--- return ---
+()
+--# saved #--
+{}
\ No newline at end of file
diff --git a/test/results/litterals.ans b/test/results/litterals.ans
new file mode 100644
index 0000000..3742c16
--- /dev/null
+++ b/test/results/litterals.ans
@@ -0,0 +1,42 @@
+--# run #--
+--- text ---
+| {}"numbers:" |
+| {}"" {}"0" {}"" |
+| {}"" {}"12" {}"" |
+| {}"" {}"0.87" {}"" |
+| {}"" {}"39.12" {}"" |
+--- text ---
+| {}"strings:" |
+| {}"" {}"foo" {}"" |
+--- text ---
+| {}"tuple:" |
+| {}"" {}"[4, 8, 9]" {}"" |
+--- text ---
+| {}"struct:" |
+| {}"" {}"{1:9, 2:8, 7:4}" {}"" |
+--- text ---
+| {}"symbols:" |
+| {}"" {}":ab" {}"" |
+--- text ---
+| {}"anchor:" |
+| {}"" {}"#jdfe" {}"" |
+| {}"" {}"#foo bar" {}"" |
+--- text ---
+| {}"boolean:" |
+| {}"" {}"false" {}"" |
+| {}"" {}"true" {}"" |
+--- text ---
+| {}"nil:" |
+| {}"" {}"()" {}"" |
+--- text ---
+| {}"pair:" |
+| {}"" {}"6:8" {}"" |
+| {}"" {}"\"d\":[]" {}"" |
+--- text ---
+| {}"function:" |
+| {}"" {}"($() 12)" {}"" |
+| {}"" {}"($(x) x)" {}"" |
+--- return ---
+()
+--# saved #--
+{}
\ No newline at end of file
diff --git a/test/tests/function custom type dispatch error.ans b/test/tests/function custom type dispatch error.ans
new file mode 100644
index 0000000..b7a764b
--- /dev/null
+++ b/test/tests/function custom type dispatch error.ans	
@@ -0,0 +1,14 @@
+:french name="french name"
+:esperanto name="esperanto name"
+
+:$ a(name::is(esperanto name))
+	|{name!value} is esperanto
+
+:$ a(name::is(french name))
+	|{name!value} is french
+
+a("pierre"!type(french name))
+
+a("idk"!type(esperanto name))
+
+a(5!type("nope"))
diff --git a/test/tests/function custom type dispatch.ans b/test/tests/function custom type dispatch.ans
new file mode 100644
index 0000000..af8029c
--- /dev/null
+++ b/test/tests/function custom type dispatch.ans	
@@ -0,0 +1,14 @@
+:french name="french name"
+:esperanto name="esperanto name"
+
+:$ a(name)
+	|{name!value} is english or generic
+
+:$ a(name::is(french name))
+	|{name!value} is french
+
+a("bob")
+
+a("pierre"!type(french name))
+
+a("idk"!type(esperanto name))
diff --git a/test/tests/litterals.ans b/test/tests/litterals.ans
new file mode 100644
index 0000000..90efb5f
--- /dev/null
+++ b/test/tests/litterals.ans
@@ -0,0 +1,36 @@
+| numbers:
+| {0}
+| {12}
+| {.87}
+| {39.12}
+
+| strings:
+| {"foo"}
+
+| tuple:
+| {[4,8,9]}
+
+| struct:
+| {{7:4,2:8,1:9}}
+
+| symbols:
+| {:ab}
+
+| anchor:
+| {#jdfe}
+| {#foo bar}
+
+| boolean:
+| {false}
+| {true}
+
+| nil:
+| {()}
+
+| pair:
+| {6:8}
+| {("d"):([])}
+
+| function:
+| {$12}
+| {$(x)x}