fix struct typing of ternary expressions (resolves #73)

src/Convert/Struct.hs

@@ -261,6 +261,11 @@ convertAsgn structs types (lhs, expr) =
 
         -- try expression conversion by looking at the *outermost* type first
         convertExpr :: Type -> Expr -> Expr
+        convertExpr t (Mux c e1 e2) =
+            Mux c e1' e2'
+            where
+                e1' = convertExpr t e1
+                e2' = convertExpr t e2
         -- TODO: This is really a conversion for using default patterns to
         -- populate arrays. Maybe this should be somewhere else?
         convertExpr (IntegerVector t sg (r:rs)) (Pattern [(":default", e)]) =

test/basic/struct_tern.sv

+module Example(flag, out);
+    typedef struct packed {
+        logic a, b;
+    } T;
+    output T out;
+    input logic flag;
+    assign out =
+        flag
+        ? '{ a: 1'b1, b: 1'b0 }
+        : '{ a: 1'b1, b: 1'b1 }
+        ;
+endmodule

test/basic/struct_tern.v

+module Example(flag, out);
+    output wire [1:0] out;
+    input wire flag;
+    assign out = flag ? 2'b10 : 2'b11;
+endmodule

test/basic/struct_tern_tb.v

+module top;
+    reg flag;
+    wire [1:0] out;
+    Example example(flag, out);
+    initial begin
+        $monitor("%2d %b %b", $time, flag, out);
+        #1 flag = 0;
+        #1 flag = 1;
+        #1 flag = 0;
+        #1 flag = 1;
+    end
+endmodule