allow underscores in name annotations

Author: dwrensha

capnpc/src/codegen.rs

@@ -111,9 +111,6 @@ fn snake_to_upper_case(s: &str) -> String {
         if c == '_' {
             result_chars.push('_');
         } else {
-            assert!(c.is_alphanumeric(),
-                    format!("non-alphanumeric character '{}', i.e. {} in identifier '{}'",
-                            c, c as usize, s));
             result_chars.push(c.to_ascii_uppercase());
         }
     }
@@ -124,9 +121,6 @@ fn camel_to_snake_case(s: &str) -> String {
     let mut result_chars: Vec<char> = Vec::new();
     let mut first_char = true;
     for c in s.chars() {
-        assert!(c.is_alphanumeric(),
-                format!("non-alphanumeric character '{}', i.e. {} in identifier '{}'",
-                        c, c as usize, s));
         if c.is_uppercase() && !first_char {
             result_chars.push('_');
         }
@@ -175,6 +169,8 @@ fn test_camel_to_snake_case() {
     assert_eq!(camel_to_snake_case("helloWorld"), "hello_world".to_string());
     assert_eq!(camel_to_snake_case("HelloWorld"), "hello_world".to_string());
     assert_eq!(camel_to_snake_case("uint32Id"), "uint32_id".to_string());
+
+    assert_eq!(camel_to_snake_case("fooBar_"), "foo_bar_".to_string());
 }
 
 #[derive(PartialEq, Clone)]