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after boxUnbox

  // access flags 0x1000001
  public crash()V
   L0
    LINENUMBER 5 L0
   L1
    LINENUMBER 6 L1
    ICONST_0
    ISTORE 2

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   L0
    LINENUMBER 5 L0
   L1
    LINENUMBER 6 L1
    ACONST_NULL
    ASTORE 3
   L2
    ACONST_NULL
    ASTORE 5
    GOTO L3

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   L0
    LINENUMBER 5 L0
   L1
    LINENUMBER 6 L1
    ACONST_NULL
    ASTORE 3
   L2
    NEW scala/runtime/ObjectRef
    DUP
    ALOAD 3

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https://gist.github.com/d1af6aaaa9cbeb618f0f82593a58ca62

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package p1

class Test {
  
  def crash: Unit = {
    var box: AnyRef = null

    def writeBox(a: AnyRef): Unit = {
      box = a
    }

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<?xml version='1.0' encoding='UTF-8'?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.scala-lang</groupId>
    <artifactId>scala-partest</artifactId>
    <packaging>jar</packaging>
    <description>Scala Compiler Testing Tool</description>
    <url>https://www.scala-lang.org/</url>
    <version>2.12.13-bin-SNAPSHOT</version>
    <licenses>

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[error] Options accepted by async:
[error]   allkernel=<bool>                 Only include kernel-mode events.
[error]   alluser=<bool>                   Only include user-mode events.
[error]   ann=<bool>                       Annotate Java method names.
[error]   cstack=<mode>                    How to traverse C stack: Supported: [fp, lbr, no].
[error]   dir=<dir>                        Output directory.
[error]   direction=<direction>            Direction(s) of flame graph. Supported: [forward,
[error]                                    reverse, both]. (default: [both])
[error]   event=<event>                    Event to sample: cpu, alloc, wall, lock, cache-misses,
[error]                                    etc. (default: [cpu])

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➜  compiler-benchmark git:(topic/case-class-o-rama) time (for v in 2.12.11 2.12.12-bin-8d19363-SNAPSHOT; do echo $v; sbt clean 'set scalaVersion in compilation := "'$v'"' 'hot -psource=scalap -prof gc -wi 3 -i 3 -f 2' ; done)
2.12.11
[info] Loading settings for project global-plugins from idea.sbt,dirtymoney.sbt,metals.sbt,gpg.sbt ...
[info] Loading global plugins from /Users/jz/.sbt/1.0/plugins
[info] Loading settings for project compiler-benchmark-build from plugins.sbt,build.sbt ...
[info] Loading project definition from /Users/jz/code/compiler-benchmark/project
[info] Loading settings for project compiler-benchmark from build.sbt ...
[info] Set current project to compiler-benchmark (in build file:/Users/jz/code/compiler-benchmark/)
[success] Total time: 0 s, completed 19/05/2020 10:21:18 AM
[info] Defining compilation / scalaVersion

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SKIP    *   4dd0abeab2 (origin/2.12.x, topic/unrelated-equals-reflexive, 2.12.x) Merge pull request #8980 from mkeskells/2.12.x_Map_++_regression
        |\
        | * ed36c8bbcc (origin/pr/8980) fix regression in Map ++
        | |  .../scala/collection/immutable/HashMap.scala     |  2 +-
        | |  .../scala/collection/immutable/HashMapTest.scala | 26 ++++++++++++++++++++
        | |  2 files changed, 27 insertions(+), 1 deletion(-)
PICK    * |   1c92061d51 Merge pull request #8971 from joroKr21/implicit-by-namme
        |\ \
        | * | eaf1b749fc (origin/pr/8971) [nomerge] Convert implicit by-name error to a type error
        | | |  src/compiler/scala/tools/nsc/ast/parser/Parsers.scala        | 4 ----

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scala> :java -c -private NonStaticLambda
Compiled from "<console>"
public class $line3.$read$$iw$$iw$NonStaticLambda {
  public scala.Function0<$line3.$read$$iw$$iw$NonStaticLambda> test();
    Code:
       0: aload_0
       1: invokedynamic #45,  0             // InvokeDynamic #0:apply:(L$line3/$read$$iw$$iw$NonStaticLambda;)Lscala/Function0;
       6: areturn

  public static final $line3.$read$$iw$$iw$NonStaticLambda $anonfun$test$1($line3.$read$$iw$$iw$NonStaticLambda);