Write negative tests

test/contracts/ambiguous_main.aes

@@ -0,0 +1,5 @@
+contract C =
+  entrypoint f() = 123
+
+contract D =
+  entrypoint f() = 123

test/contracts/code_errors/child_with_decls.aes

@@ -0,0 +1,5 @@
+contract C =
+  entrypoint f : () => unit
+
+main contract M =
+  entrypoint f() = 123

test/contracts/factories_type_errors.aes

@@ -0,0 +1,24 @@
+contract interface Kaboom =
+  entrypoint init : () => void
+
+contract Bakoom =
+  type state = int
+  entrypoint init(x, b) = if(b) x else 0
+
+main contract Test =
+  stateful entrypoint test(k : Kaboom) =
+    let k_bad1 = Chain.clone() : Kaboom
+    let k_bad2 = Chain.clone(ref=k, 123, true)
+    let k_bad3 = Chain.clone(ref=k, gas=true)
+    let k_bad4 = Chain.create() : Kaboom
+    let k_gud1 = Chain.clone(ref=k)
+    let Some(k_gud2) = Chain.clone(ref=k, protected=true)
+    let Some(k_gud3) = Chain.clone(ref=k, value=10, protected=true, gas=123)
+
+    let b_bad1 = Chain.create() : Bakoom
+    let b_bad2 = Chain.create(123, true, protected=true) : Bakoom
+    let b_bad3 = Chain.create(123, true, value=true) : Bakoom
+    let b_gud1 = Chain.create(123, true) : Bakoom
+    let b_gud2 = Chain.create(123, true, value=100) : Bakoom
+
+    b_gud1

test/contracts/multiple_main_contracts.aes

@@ -0,0 +1,5 @@
+main contract C =
+  entrypoint f() = 123
+
+main contract D =
+  entrypoint f() = 123

test/contracts/no_main_contract.aes

@@ -0,0 +1,2 @@
+contract interface C =
+  entrypoint f : () => unit