zig fmt: fix implementation of firstToken() for fn call

Author: andrewrk

std/zig/ast.zig

@@ -1673,6 +1673,10 @@ pub const Node = struct {
         }
 
         pub fn firstToken(self: &SuffixOp) TokenIndex {
+            switch (self.op) {
+                @TagType(Op).Call => |*call_info| if (call_info.async_attr) |async_attr| return async_attr.firstToken(),
+                else => {},
+            }
             return self.lhs.firstToken();
         }
 

std/zig/parser_test.zig

@@ -1,3 +1,14 @@
+test "zig fmt: async call in if condition" {
+    try testCanonical(
+        \\comptime {
+        \\    if (async<a> b()) {
+        \\        a();
+        \\    }
+        \\}
+        \\
+    );
+}
+
 test "zig fmt: 2nd arg multiline string" {
     try testCanonical(
         \\comptime {

std/zig/render.zig

@@ -213,13 +213,13 @@ fn renderExpression(allocator: &mem.Allocator, stream: var, tree: &ast.Tree, ind
             const async_attr = @fieldParentPtr(ast.Node.AsyncAttribute, "base", base);
 
             if (async_attr.allocator_type) |allocator_type| {
-                try renderToken(tree, stream, async_attr.async_token, indent, start_col, Space.None);
+                try renderToken(tree, stream, async_attr.async_token, indent, start_col, Space.None); // async
 
-                try renderToken(tree, stream, tree.nextToken(async_attr.async_token), indent, start_col, Space.None);
-                try renderExpression(allocator, stream, tree, indent, start_col, allocator_type, Space.None);
-                return renderToken(tree, stream, tree.nextToken(allocator_type.lastToken()), indent, start_col, space);
+                try renderToken(tree, stream, tree.nextToken(async_attr.async_token), indent, start_col, Space.None); // <
+                try renderExpression(allocator, stream, tree, indent, start_col, allocator_type, Space.None); // allocator
+                return renderToken(tree, stream, tree.nextToken(allocator_type.lastToken()), indent, start_col, space); // >
             } else {
-                return renderToken(tree, stream, async_attr.async_token, indent, start_col, space);
+                return renderToken(tree, stream, async_attr.async_token, indent, start_col, space); // async
             }
         },