diff --git a/Cargo.lock b/Cargo.lock
index 8ed396c815..2631b2b0c7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -37,6 +37,15 @@ version = "1.0.60"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c794e162a5eff65c72ef524dfe393eb923c354e350bb78b9c7383df13f3bc142"
 
+[[package]]
+name = "ascii-canvas"
+version = "3.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8824ecca2e851cec16968d54a01dd372ef8f95b244fb84b84e70128be347c3c6"
+dependencies = [
+ "term",
+]
+
 [[package]]
 name = "async-channel"
 version = "1.7.0"
@@ -197,6 +206,21 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "bit-set"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0700ddab506f33b20a03b13996eccd309a48e5ff77d0d95926aa0210fb4e95f1"
+dependencies = [
+ "bit-vec",
+]
+
+[[package]]
+name = "bit-vec"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "349f9b6a179ed607305526ca489b34ad0a41aed5f7980fa90eb03160b69598fb"
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -247,6 +271,17 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "bstr"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba3569f383e8f1598449f1a423e72e99569137b47740b1da11ef19af3d5c3223"
+dependencies = [
+ "lazy_static",
+ "memchr",
+ "regex-automata",
+]
+
 [[package]]
 name = "bumpalo"
 version = "3.10.0"
@@ -491,6 +526,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "diff"
+version = "0.1.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56254986775e3233ffa9c4d7d3faaf6d36a2c09d30b20687e9f88bc8bafc16c8"
+
 [[package]]
 name = "digest"
 version = "0.8.1"
@@ -528,6 +569,16 @@ dependencies = [
  "dirs-sys",
 ]
 
+[[package]]
+name = "dirs-next"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b98cf8ebf19c3d1b223e151f99a4f9f0690dca41414773390fc824184ac833e1"
+dependencies = [
+ "cfg-if 1.0.0",
+ "dirs-sys-next",
+]
+
 [[package]]
 name = "dirs-sys"
 version = "0.3.7"
@@ -539,12 +590,32 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "dirs-sys-next"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ebda144c4fe02d1f7ea1a7d9641b6fc6b580adcfa024ae48797ecdeb6825b4d"
+dependencies = [
+ "libc",
+ "redox_users",
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "either"
 version = "1.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f107b87b6afc2a64fd13cac55fe06d6c8859f12d4b14cbcdd2c67d0976781be"
 
+[[package]]
+name = "ena"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d7402b94a93c24e742487327a7cd839dc9d36fec9de9fb25b09f2dae459f36c3"
+dependencies = [
+ "log",
+]
+
 [[package]]
 name = "event-listener"
 version = "2.5.3"
@@ -587,6 +658,12 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "fixedbitset"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -885,6 +962,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9a9d19fa1e79b6215ff29b9d6880b706147f16e9b1dbb1e4e5947b5b02bc5e3"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itoa"
 version = "1.0.3"
@@ -919,11 +1005,37 @@ dependencies = [
  "log",
 ]
 
+[[package]]
+name = "lalrpop"
+version = "0.19.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b30455341b0e18f276fa64540aff54deafb54c589de6aca68659c63dd2d5d823"
+dependencies = [
+ "ascii-canvas",
+ "atty",
+ "bit-set",
+ "diff",
+ "ena",
+ "itertools",
+ "lalrpop-util",
+ "petgraph",
+ "pico-args",
+ "regex",
+ "regex-syntax",
+ "string_cache",
+ "term",
+ "tiny-keccak",
+ "unicode-xid",
+]
+
 [[package]]
 name = "lalrpop-util"
 version = "0.19.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bcf796c978e9b4d983414f4caedc9273aa33ee214c5b887bd55fde84c85d2dc4"
+dependencies = [
+ "regex",
+]
 
 [[package]]
 name = "lazy_static"
@@ -963,6 +1075,15 @@ dependencies = [
  "value-bag",
 ]
 
+[[package]]
+name = "lz4_flex"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c038063f7a78126c539d666a0323a2032de5e7366012cd14a6eafc5ba290bbd6"
+dependencies = [
+ "twox-hash",
+]
+
 [[package]]
 name = "memchr"
 version = "2.5.0"
@@ -1041,6 +1162,12 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "new_debug_unreachable"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e4a24736216ec316047a1fc4252e27dabb04218aa4a3f37c6e7ddbf1f9782b54"
+
 [[package]]
 name = "nix"
 version = "0.24.2"
@@ -1089,6 +1216,17 @@ dependencies = [
  "autocfg",
  "num-integer",
  "num-traits",
+ "serde",
+]
+
+[[package]]
+name = "num-complex"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ae39348c8bc5fbd7f40c727a9925f03517afd2ab27d46702108b6a7e5414c19"
+dependencies = [
+ "num-traits",
+ "serde",
 ]
 
 [[package]]
@@ -1173,6 +1311,16 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "petgraph"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6d5014253a1331579ce62aa67443b4a658c5e7dd03d4bc6d302b94474888143"
+dependencies = [
+ "fixedbitset",
+ "indexmap",
+]
+
 [[package]]
 name = "phf"
 version = "0.8.0"
@@ -1249,6 +1397,12 @@ dependencies = [
  "siphasher",
 ]
 
+[[package]]
+name = "pico-args"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db8bcd96cb740d03149cbad5518db9fd87126a10ab519c011893b1754134c468"
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.9"
@@ -1280,6 +1434,12 @@ version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eb9f9e6e233e5c4a35559a617bf40a4ec447db2e84c20b55a6f83167b7e57872"
 
+[[package]]
+name = "precomputed-hash"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
+
 [[package]]
 name = "proc-macro-error"
 version = "1.0.4"
@@ -1517,6 +1677,12 @@ dependencies = [
  "regex-syntax",
 ]
 
+[[package]]
+name = "regex-automata"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
+
 [[package]]
 name = "regex-syntax"
 version = "0.6.27"
@@ -1561,17 +1727,37 @@ dependencies = [
 [[package]]
 name = "rustpython-ast"
 version = "0.1.0"
-source = "git+https://github.com/RustPython/RustPython.git?rev=dff916d45c5d13074d21ad329a5ab68a6499426a#dff916d45c5d13074d21ad329a5ab68a6499426a"
+source = "git+https://github.com/RustPython/RustPython.git?rev=f1c7aebfad707526602c8162c8094a67129b6731#f1c7aebfad707526602c8162c8094a67129b6731"
 dependencies = [
  "num-bigint",
+ "rustpython-bytecode",
+]
+
+[[package]]
+name = "rustpython-bytecode"
+version = "0.1.2"
+source = "git+https://github.com/RustPython/RustPython.git?rev=f1c7aebfad707526602c8162c8094a67129b6731#f1c7aebfad707526602c8162c8094a67129b6731"
+dependencies = [
+ "bincode",
+ "bitflags",
+ "bstr",
+ "itertools",
+ "lz4_flex",
+ "num-bigint",
+ "num-complex",
+ "serde",
+ "static_assertions",
 ]
 
 [[package]]
 name = "rustpython-parser"
 version = "0.1.2"
-source = "git+https://github.com/RustPython/RustPython.git?rev=dff916d45c5d13074d21ad329a5ab68a6499426a#dff916d45c5d13074d21ad329a5ab68a6499426a"
+source = "git+https://github.com/RustPython/RustPython.git?rev=f1c7aebfad707526602c8162c8094a67129b6731#f1c7aebfad707526602c8162c8094a67129b6731"
 dependencies = [
  "ahash",
+ "anyhow",
+ "itertools",
+ "lalrpop",
  "lalrpop-util",
  "log",
  "num-bigint",
@@ -1585,6 +1771,12 @@ dependencies = [
  "unicode_names2",
 ]
 
+[[package]]
+name = "rustversion"
+version = "1.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "97477e48b4cf8603ad5f7aaf897467cf42ab4218a38ef76fb14c2d6773a6d6a8"
+
 [[package]]
 name = "ryu"
 version = "1.0.11"
@@ -1752,6 +1944,25 @@ dependencies = [
  "thiserror",
 ]
 
+[[package]]
+name = "static_assertions"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+
+[[package]]
+name = "string_cache"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "213494b7a2b503146286049378ce02b482200519accc31872ee8be91fa820a08"
+dependencies = [
+ "new_debug_unreachable",
+ "once_cell",
+ "parking_lot",
+ "phf_shared 0.10.0",
+ "precomputed-hash",
+]
+
 [[package]]
 name = "strsim"
 version = "0.10.0"
@@ -1789,6 +2000,17 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "term"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c59df8ac95d96ff9bede18eb7300b0fda5e5d8d90960e76f8e14ae765eedbf1f"
+dependencies = [
+ "dirs-next",
+ "rustversion",
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "termcolor"
 version = "1.1.3"
@@ -1866,6 +2088,16 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "twox-hash"
+version = "1.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "97fee6b57c6a41524a810daee9286c02d7752c4253064d0b05472833a438f675"
+dependencies = [
+ "cfg-if 0.1.10",
+ "static_assertions",
+]
+
 [[package]]
 name = "typenum"
 version = "1.15.0"
@@ -1930,6 +2162,12 @@ version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c4f5b37a154999a8f3f98cc23a628d850e154479cd94decf3414696e12e31aaf"
 
+[[package]]
+name = "unicode-xid"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "957e51f3646910546462e67d5f7599b9e4fb8acdd304b087a6494730f9eebf04"
+
 [[package]]
 name = "unicode_names2"
 version = "0.5.0"
diff --git a/Cargo.toml b/Cargo.toml
index 03741c8e3b..03f3f1905d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,7 +23,7 @@ notify = { version = "4.0.17" }
 pyo3 = { version = "0.16.5", features = ["extension-module", "abi3-py37"] }
 rayon = { version = "1.5.3" }
 regex = { version = "1.6.0" }
-rustpython-parser = { git = "https://github.com/RustPython/RustPython.git", rev = "dff916d45c5d13074d21ad329a5ab68a6499426a" }
+rustpython-parser = { features=["lalrpop"], git = "https://github.com/RustPython/RustPython.git", rev = "f1c7aebfad707526602c8162c8094a67129b6731" }
 serde = { version = "1.0.143", features = ["derive"] }
 serde_json = { version = "1.0.83" }
 toml = { version = "0.5.9"}
diff --git a/src/check_ast.rs b/src/check_ast.rs
index 07e30a49c2..185c11f85e 100644
--- a/src/check_ast.rs
+++ b/src/check_ast.rs
@@ -67,7 +67,7 @@ impl Visitor for Checker<'_> {
                     .contains(CheckKind::ImportStarUsage.code())
                 {
                     for alias in names {
-                        if alias.name == "*" {
+                        if alias.node.name == "*" {
                             self.checks.push(Check {
                                 kind: CheckKind::ImportStarUsage,
                                 location: stmt.location,
@@ -218,7 +218,7 @@ pub fn check_ast(python_ast: &Suite, settings: &Settings) -> Vec<Check> {
 mod tests {
     use std::collections::BTreeSet;
 
-    use rustpython_parser::ast::{Alias, Location, Stmt, StmtKind};
+    use rustpython_parser::ast::{Alias, AliasData, Location, Stmt, StmtKind};
 
     use crate::check_ast::Checker;
     use crate::checks::CheckKind::ImportStarUsage;
@@ -239,11 +239,14 @@ mod tests {
             custom: (),
             node: StmtKind::ImportFrom {
                 module: Some("bar".to_string()),
-                names: vec![Alias {
-                    name: "*".to_string(),
-                    asname: None,
-                }],
-                level: 0,
+                names: vec![Alias::new(
+                    Default::default(),
+                    AliasData {
+                        name: "*".to_string(),
+                        asname: None,
+                    },
+                )],
+                level: None,
             },
         });
 
diff --git a/src/visitor.rs b/src/visitor.rs
index 0cbddba3eb..4631190e63 100644
--- a/src/visitor.rs
+++ b/src/visitor.rs
@@ -230,6 +230,10 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
                 visitor.visit_stmt(stmt)
             }
         }
+        StmtKind::Match { subject, .. } => {
+            // TODO(charlie): Handle `cases`.
+            visitor.visit_expr(subject);
+        }
         StmtKind::Raise { exc, cause } => {
             if let Some(expr) = exc {
                 visitor.visit_expr(expr)
@@ -326,7 +330,7 @@ pub fn walk_expr<V: Visitor + ?Sized>(visitor: &mut V, expr: &Expr) {
             visitor.visit_expr(orelse);
         }
         ExprKind::Dict { keys, values } => {
-            for expr in keys.iter().flatten() {
+            for expr in keys {
                 visitor.visit_expr(expr)
             }
             for expr in values {
@@ -505,7 +509,7 @@ pub fn walk_arguments<V: Visitor + ?Sized>(visitor: &mut V, arguments: &Argument
     for arg in &arguments.kwonlyargs {
         visitor.visit_arg(arg);
     }
-    for expr in arguments.kw_defaults.iter().flatten() {
+    for expr in &arguments.kw_defaults {
         visitor.visit_expr(expr)
     }
     if let Some(arg) = &arguments.kwarg {