fix: backport changes for latest rustc api comaptibility

Author: calebcartwright

Diff for: rust-toolchain

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2021-03-26"
+channel = "nightly-2021-05-01"
 components = ["rustc-dev"]

Diff for: src/macros.rs

@@ -13,7 +13,7 @@ use std::collections::HashMap;
 use std::panic::{catch_unwind, AssertUnwindSafe};
 
 use rustc_ast::token::{BinOpToken, DelimToken, Token, TokenKind};
-use rustc_ast::tokenstream::{Cursor, LazyTokenStream, TokenStream, TokenTree};
+use rustc_ast::tokenstream::{Cursor, Spacing, TokenStream, TokenTree};
 use rustc_ast::{ast, ptr};
 use rustc_ast_pretty::pprust;
 use rustc_parse::parser::{ForceCollect, Parser};
@@ -1212,7 +1212,7 @@ pub(crate) fn convert_try_mac(
             kind: ast::ExprKind::Try(parser.parse_expr().ok()?),
             span: mac.span(), // incorrect span, but shouldn't matter too much
             attrs: ast::AttrVec::new(),
-            tokens: Some(LazyTokenStream::new(ts)),
+            tokens: None,
         })
     } else {
         None
@@ -1259,7 +1259,7 @@ impl MacroParser {
             TokenTree::Token(..) => return None,
             TokenTree::Delimited(delimited_span, d, _) => (delimited_span.open.lo(), d),
         };
-        let args = tok.joint();
+        let args = TokenStream::new(vec![(tok, Spacing::Joint)]);
         match self.toks.next()? {
             TokenTree::Token(Token {
                 kind: TokenKind::FatArrow,

Diff for: src/modules.rs

@@ -55,6 +55,7 @@ impl<'a> Module<'a> {
 }
 
 impl<'a> AstLike for Module<'a> {
+    const SUPPORTS_CUSTOM_INNER_ATTRS: bool = true;
     fn attrs(&self) -> &[ast::Attribute] {
         &self.inner_attr
     }