Don't allow type synonyms with the same name as existing types

2 files changed, 28 insertions, 0 deletions

diff --git a/test/typecheck/pass/poly_vector/v2.expect b/test/typecheck/pass/poly_vector/v2.expect
new file mode 100644
index 00000000..dfe0fae9
--- /dev/null
+++ b/test/typecheck/pass/poly_vector/v2.expect
@@ -0,0 +1,6 @@
+Type error:
+[poly_vector/v2.sail]:5:5-14
+5 |type bitvector('n, 'ord: Order) = vector('n, 'ord, bit)
+  |     ^-------^
+  | Cannot define type synonym bitvector, as a type or synonym with that name already exists
+  | 
diff --git a/test/typecheck/pass/poly_vector/v2.sail b/test/typecheck/pass/poly_vector/v2.sail
new file mode 100644
index 00000000..1b956748
--- /dev/null
+++ b/test/typecheck/pass/poly_vector/v2.sail
@@ -0,0 +1,22 @@
+default Order dec
+
+$include <prelude.sail>
+
+type bitvector('n, 'ord: Order) = vector('n, 'ord, bit)
+
+val "to_generic" : forall 'n. bitvector('n, dec) -> vector('n, dec, bit)
+
+val "print_endline" : string -> unit
+
+function my_length forall 'n ('a : Type). (xs: vector('n, dec, 'a)) -> int('n) = {
+  length(xs)
+}
+
+function main() -> unit = {
+  let xs : bits(32) = 0xFFFF_FFFF;
+  if my_length(to_generic(xs)) == 32 then {
+    print_endline("ok")
+  } else {
+    print_endline("false")
+  }
+}