feat: allow slice! macro to index tuples (#2598)

* Allow slice! macro to index tuples

* Undo changes to component tests

---------

Co-authored-by: Greg Johnston <greg.johnston@gmail.com>

leptos_macro/src/slice.rs

@@ -11,15 +11,15 @@ use syn::{
 
 struct SliceMacroInput {
     root: syn::Ident,
-    path: Punctuated<syn::Ident, Token![.]>,
+    path: Punctuated<syn::Member, Token![.]>,
 }
 
 impl Parse for SliceMacroInput {
     fn parse(input: ParseStream) -> syn::Result<Self> {
         let root: syn::Ident = input.parse()?;
         input.parse::<Token![.]>()?;
         // do not accept trailing punctuation
-        let path: Punctuated<syn::Ident, Token![.]> =
+        let path: Punctuated<syn::Member, Token![.]> =
             Punctuated::parse_separated_nonempty(input)?;
 
         if path.is_empty() {

leptos_macro/tests/slice.rs

@@ -10,9 +10,12 @@ pub struct OuterState {
 #[derive(Clone, PartialEq, Default)]
 pub struct InnerState {
     inner_count: i32,
-    inner_name: String,
+    inner_tuple: InnerTuple,
 }
 
+#[derive(Clone, PartialEq, Default)]
+pub struct InnerTuple(String);
+
 #[test]
 fn green() {
     let _ = create_runtime();
@@ -22,7 +25,7 @@ fn green() {
     let (_, _) = slice!(outer_signal.count);
 
     let (_, _) = slice!(outer_signal.inner.inner_count);
-    let (_, _) = slice!(outer_signal.inner.inner_name);
+    let (_, _) = slice!(outer_signal.inner.inner_tuple.0);
 }
 
 #[test]

leptos_macro/tests/slice/red.stderr

@@ -14,15 +14,15 @@ error: expected `.`
    |
    = note: this error originates in the macro `slice` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: unexpected end of input, expected identifier
+error: unexpected end of input, expected identifier or integer
   --> tests/slice/red.rs:25:18
    |
 25 |     let (_, _) = slice!(outer_signal.);
    |                  ^^^^^^^^^^^^^^^^^^^^^
    |
    = note: this error originates in the macro `slice` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: unexpected end of input, expected identifier
+error: unexpected end of input, expected identifier or integer
   --> tests/slice/red.rs:27:18
    |
 27 |     let (_, _) = slice!(outer_signal.inner.);