From c81eecd644f6232bfd6e64840a9f41c9e738a205 Mon Sep 17 00:00:00 2001
From: Ayaz Hafiz <ayaz@rwx.com>
Date: Tue, 9 Aug 2022 18:04:35 -0700
Subject: [PATCH] Print back records without trailing comma

---
 crates/compiler/test_derive/src/encoding.rs   |  9 +++-----
 .../compiler/test_derive/src/pretty_print.rs  | 21 +++++++++++--------
 2 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/crates/compiler/test_derive/src/encoding.rs b/crates/compiler/test_derive/src/encoding.rs
index 1c72e631af..5131918a7f 100644
--- a/crates/compiler/test_derive/src/encoding.rs
+++ b/crates/compiler/test_derive/src/encoding.rs
@@ -174,10 +174,7 @@ fn one_field_record() {
               \#Derived.bytes, #Derived.fmt ->
                 Encode.appendWith
                   #Derived.bytes
-                  (Encode.record
-                    [
-                      { value: Encode.toEncoder #Derived.rcd.a, key: "a", },
-                    ])
+                  (Encode.record [{ value: Encode.toEncoder #Derived.rcd.a, key: "a" }])
                   #Derived.fmt
         "###
         )
@@ -202,8 +199,8 @@ fn two_field_record() {
                   #Derived.bytes
                   (Encode.record
                     [
-                      { value: Encode.toEncoder #Derived.rcd.a, key: "a", },
-                      { value: Encode.toEncoder #Derived.rcd.b, key: "b", },
+                      { value: Encode.toEncoder #Derived.rcd.a, key: "a" },
+                      { value: Encode.toEncoder #Derived.rcd.b, key: "b" },
                     ])
                   #Derived.fmt
         "###
diff --git a/crates/compiler/test_derive/src/pretty_print.rs b/crates/compiler/test_derive/src/pretty_print.rs
index ea7abe3e59..d263b3a15e 100644
--- a/crates/compiler/test_derive/src/pretty_print.rs
+++ b/crates/compiler/test_derive/src/pretty_print.rs
@@ -178,15 +178,18 @@ fn expr<'a>(c: &Ctx, p: EPrec, f: &'a Arena<'a>, e: &'a Expr) -> DocBuilder<'a,
         Record { fields, .. } => f
             .reflow("{")
             .append(
-                f.concat(fields.iter().map(|(name, field)| {
-                    let field = f
-                        .text(name.as_str())
-                        .append(f.reflow(": "))
-                        .append(expr(c, Free, f, &field.loc_expr.value))
-                        .nest(2)
-                        .group();
-                    f.line().append(field).append(",")
-                }))
+                f.intersperse(
+                    fields.iter().map(|(name, field)| {
+                        let field = f
+                            .text(name.as_str())
+                            .append(f.reflow(": "))
+                            .append(expr(c, Free, f, &field.loc_expr.value))
+                            .nest(2)
+                            .group();
+                        f.line().append(field)
+                    }),
+                    f.reflow(","),
+                )
                 .nest(2)
                 .group(),
             )