tamer: xir::{tree::=>}attr: Move

With the introduction of XIRF, attribute parsing is no longer a XIRT thing.

DEV-10863

tamer/src/xir.rs

@@ -69,6 +69,7 @@ pub use error::Error;
 mod escape;
 pub use escape::{DefaultEscaper, Escaper};
 
+pub mod attr;
 pub mod flat;
 pub mod iter;
 pub mod parse;

tamer/src/xir/flat.rs

@@ -37,14 +37,11 @@
 //!   of the caller.
 
 use super::{
+    attr::{Attr, AttrParseError, AttrParseState},
     parse::{
         ParseState, ParseStateResult, ParseStatus, ParsedResult,
         TransitionResult,
     },
-    tree::{
-        attr::{AttrParseError, AttrParseState},
-        Attr,
-    },
     QName, Token, TokenStream, Whitespace,
 };
 use crate::{span::Span, sym::SymbolId, xir::parse::Transition};

tamer/src/xir/tree.rs

@@ -173,13 +173,9 @@
 //!
 //! [state machine]: https://en.wikipedia.org/wiki/Finite-state_machine
 
-pub mod attr;
-
-use self::{
-    super::parse::{
-        ParseError, ParseResult, ParseState, ParseStatus, ParsedResult,
-    },
-    attr::{AttrParseError, AttrParseState},
+use self::super::{
+    attr::{Attr, AttrList, AttrParseError, AttrParseState},
+    parse::{ParseError, ParseResult, ParseState, ParseStatus, ParsedResult},
 };
 
 use super::{
@@ -188,8 +184,6 @@ use super::{
 use crate::{span::Span, sym::SymbolId, xir::parse::Transition};
 use std::{error::Error, fmt::Display, result};
 
-pub use attr::{Attr, AttrList};
-
 type Parsed = super::parse::Parsed<Tree>;
 
 /// A XIR tree (XIRT).