Add derive macro for Syntax (used to be Language) (#51)

test_suite/tests/ui/static_text/empty_expr.rs

@@ -0,0 +1,11 @@
+use cstree::Syntax;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Syntax)]
+#[repr(u32)]
+pub enum SyntaxKind {
+    A,
+    #[static_text()]
+    B,
+}
+
+fn main() {}

test_suite/tests/ui/static_text/empty_expr.stderr

@@ -0,0 +1,11 @@
+error: argument to `static_text` must be a string literal: `#[static_text("...")]`
+ --> tests/ui/static_text/empty_expr.rs:7:7
+  |
+7 |     #[static_text()]
+  |       ^^^^^^^^^^^^^
+
+error: unexpected end of input, expected string literal
+ --> tests/ui/static_text/empty_expr.rs:7:19
+  |
+7 |     #[static_text()]
+  |                   ^

test_suite/tests/ui/static_text/missing_text.rs

@@ -0,0 +1,11 @@
+use cstree::Syntax;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Syntax)]
+#[repr(u32)]
+pub enum SyntaxKind {
+    A,
+    #[static_text]
+    B,
+}
+
+fn main() {}

test_suite/tests/ui/static_text/missing_text.stderr

@@ -0,0 +1,5 @@
+error: missing text for `static_text`: try `#[static_text("...")]`
+ --> tests/ui/static_text/missing_text.rs:7:5
+  |
+7 |     #[static_text]
+  |     ^^^^^^^^^^^^^^

test_suite/tests/ui/static_text/non_expr.rs

@@ -0,0 +1,11 @@
+use cstree::Syntax;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Syntax)]
+#[repr(u32)]
+pub enum SyntaxKind {
+    A,
+    #[static_text(SyntaxKind)]
+    B,
+}
+
+fn main() {}

test_suite/tests/ui/static_text/non_expr.stderr

@@ -0,0 +1,11 @@
+error: argument to `static_text` must be a string literal: `#[static_text("...")]`
+ --> tests/ui/static_text/non_expr.rs:7:7
+  |
+7 |     #[static_text(SyntaxKind)]
+  |       ^^^^^^^^^^^^^^^^^^^^^^^
+
+error: expected string literal
+ --> tests/ui/static_text/non_expr.rs:7:19
+  |
+7 |     #[static_text(SyntaxKind)]
+  |                   ^^^^^^^^^^

test_suite/tests/ui/static_text/non_string_expr.rs

@@ -0,0 +1,11 @@
+use cstree::Syntax;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Syntax)]
+#[repr(u32)]
+pub enum SyntaxKind {
+    A,
+    #[static_text(foo + 3)]
+    B,
+}
+
+fn main() {}

test_suite/tests/ui/static_text/non_string_expr.stderr

@@ -0,0 +1,11 @@
+error: argument to `static_text` must be a string literal: `#[static_text("...")]`
+ --> tests/ui/static_text/non_string_expr.rs:7:7
+  |
+7 |     #[static_text(foo + 3)]
+  |       ^^^^^^^^^^^^^^^^^^^^
+
+error: expected string literal
+ --> tests/ui/static_text/non_string_expr.rs:7:19
+  |
+7 |     #[static_text(foo + 3)]
+  |                   ^^^

test_suite/tests/ui/static_text/text_assigned.rs

@@ -0,0 +1,11 @@
+use cstree::Syntax;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Syntax)]
+#[repr(u32)]
+pub enum SyntaxKind {
+    A,
+    #[static_text = "b"]
+    B,
+}
+
+fn main() {}

test_suite/tests/ui/static_text/text_assigned.stderr

@@ -0,0 +1,5 @@
+error: `static_text` takes the text as a function argument: `#[static_text("...")]`
+ --> tests/ui/static_text/text_assigned.rs:7:5
+  |
+7 |     #[static_text = "b"]
+  |     ^^^^^^^^^^^^^^^^^^^^