Merge #10642

10642: minor: Add dummy impls for `trace_macros` and `log_syntax` r=Veykril a=Veykril

Both of these are macros for debugging macros and as such don't really need an implementation for us.
Closes https://github.com/rust-analyzer/rust-analyzer/issues/2212
bors r+

Co-authored-by: Lukas Wirth <lukastw97@gmail.com>

crates/hir_expand/src/builtin_fn_macro.rs

@@ -113,6 +113,8 @@ register_builtin! {
     (cfg, Cfg) => cfg_expand,
     (core_panic, CorePanic) => panic_expand,
     (std_panic, StdPanic) => panic_expand,
+    (log_syntax, LogSyntax) => log_syntax_expand,
+    (trace_macros, TraceMacros) => trace_macros_expand,
 
     EAGER:
     (compile_error, CompileError) => compile_error_expand,
@@ -148,6 +150,22 @@ fn line_expand(
     ExpandResult::ok(expanded)
 }
 
+fn log_syntax_expand(
+    _db: &dyn AstDatabase,
+    _id: MacroCallId,
+    _tt: &tt::Subtree,
+) -> ExpandResult<tt::Subtree> {
+    ExpandResult::ok(quote! {})
+}
+
+fn trace_macros_expand(
+    _db: &dyn AstDatabase,
+    _id: MacroCallId,
+    _tt: &tt::Subtree,
+) -> ExpandResult<tt::Subtree> {
+    ExpandResult::ok(quote! {})
+}
+
 fn stringify_expand(
     _db: &dyn AstDatabase,
     _id: MacroCallId,

crates/hir_expand/src/name.rs

@@ -226,28 +226,30 @@ pub mod known {
         len,
         is_empty,
         // Builtin macros
-        file,
-        column,
-        const_format_args,
-        compile_error,
-        line,
-        module_path,
+        asm,
         assert,
-        core_panic,
-        std_panic,
-        stringify,
-        concat,
+        column,
+        compile_error,
         concat_idents,
-        include,
+        concat,
+        const_format_args,
+        core_panic,
+        env,
+        file,
+        format_args_nl,
+        format_args,
+        global_asm,
         include_bytes,
         include_str,
-        format_args,
-        format_args_nl,
-        env,
-        option_env,
+        include,
+        line,
         llvm_asm,
-        asm,
-        global_asm,
+        log_syntax,
+        module_path,
+        option_env,
+        std_panic,
+        stringify,
+        trace_macros,
         // Builtin derives
         Copy,
         Clone,