Add new acceptance test scenario: 052

Pattern-match on unary constructors.

examples/acceptance_tests/052/aiken.lock

@@ -0,0 +1,5 @@
+# This file was generated by Aiken
+# You typically do not need to edit this file
+
+requirements = []
+packages = []

examples/acceptance_tests/052/aiken.toml

@@ -0,0 +1,3 @@
+name = 'aiken-lang/acceptance_test_052'
+version = '0.0.0'
+description = ''

examples/acceptance_tests/052/lib/tests.ak

@@ -0,0 +1,17 @@
+type TransactionId {
+  inner: ByteArray,
+}
+
+test pattern_match_let() {
+  let x = TransactionId { inner: #"0000" }
+  let TransactionId(y) = x
+  y == #"0000"
+}
+
+test pattern_match_when() {
+  let x = TransactionId { inner: #"0000" }
+  let y = when x is {
+    TransactionId(y) -> y
+  }
+  y == #"0000"
+}