feat: modernize parser

maud/tests/warnings/attribute-missing-value.stderr

@@ -1,4 +1,4 @@
-error: unexpected end of input
+error: unexpected end of input, expected one of: curly braces, literal, parentheses, identifier, `.`, `#`, `@`, `;`
  --> $DIR/attribute-missing-value.rs:4:5
   |
 4 | /     html! {

maud/tests/warnings/class-shorthand-missing-value.stderr

@@ -1,4 +1,4 @@
-error: unexpected end of input
+error: unexpected end of input, expected one of: curly braces, literal, parentheses, identifier, `.`, `#`, `@`, `;`
  --> $DIR/class-shorthand-missing-value.rs:4:5
   |
 4 | /     html! {

maud/tests/warnings/let-without-block.rs

@@ -0,0 +1,9 @@
+use maud::html;
+
+fn main() {
+    html! {
+        p.@let x = 1; {
+            (x)
+        }
+    };
+}

maud/tests/warnings/let-without-block.stderr

@@ -0,0 +1,5 @@
+error: `@let` bindings are only allowed inside blocks
+ --> tests/warnings/let-without-block.rs:5:11
+  |
+5 |         p.@let x = 1; {
+  |           ^^^^^^^^^^^

maud/tests/warnings/non-closed-element.stderr

@@ -1,4 +1,4 @@
-error: expected `;`, found end of macro
+error: unexpected end of input, expected one of: identifier, literal, `.`, `#`, curly braces, `;`
  --> $DIR/non-closed-element.rs:4:5
   |
 4 | /     html! {

maud/tests/warnings/non-string-literal.stderr

@@ -11,43 +11,43 @@ error: literal must be double-quoted: `"42usize"`
   |         ^^^^^^^
 
 error: literal must be double-quoted: `"42.0"`
- --> tests/warnings/non-string-literal.rs:7:9
+ --> $DIR/non-string-literal.rs:7:9
   |
 7 |         42.0
   |         ^^^^
 
 error: literal must be double-quoted: `"a"`
- --> tests/warnings/non-string-literal.rs:8:9
+ --> $DIR/non-string-literal.rs:8:9
   |
 8 |         'a'
   |         ^^^
 
 error: expected string
- --> tests/warnings/non-string-literal.rs:9:9
+ --> $DIR/non-string-literal.rs:9:9
   |
 9 |         b"a"
   |         ^^^^
 
 error: expected string
-  --> tests/warnings/non-string-literal.rs:10:9
+  --> $DIR/non-string-literal.rs:10:9
    |
 10 |         b'a'
    |         ^^^^
 
 error: attribute value must be a string
-  --> tests/warnings/non-string-literal.rs:13:24
+  --> $DIR/non-string-literal.rs:13:15
    |
 13 |         input disabled=true;
-   |                        ^^^^
+   |               ^^^^^^^^^^^^^
    |
    = help: to declare an empty attribute, omit the equals sign: `disabled`
    = help: to toggle the attribute, use square brackets: `disabled[some_boolean_flag]`
 
 error: attribute value must be a string
-  --> tests/warnings/non-string-literal.rs:14:24
+  --> $DIR/non-string-literal.rs:14:15
    |
 14 |         input disabled=false;
-   |                        ^^^^^
+   |               ^^^^^^^^^^^^^^
    |
    = help: to declare an empty attribute, omit the equals sign: `disabled`
    = help: to toggle the attribute, use square brackets: `disabled[some_boolean_flag]`

maud_macros/Cargo.toml

@@ -12,10 +12,10 @@ repository.workspace = true
 edition.workspace = true
 
 [dependencies]
-syn = "2"
+syn = { version = "2", features = ["extra-traits", "full"] }
 quote = "1.0.7"
 proc-macro2 = "1.0.23"
-proc-macro-error = { version = "1.0.0", default-features = false }
+proc-macro2-diagnostics = { version = "0.10", default-features = false }
 
 [lib]
 name = "maud_macros"