Cannot trigger an inline macro from a compiler plugin

[Atry]

minimized code

I've created a minimized reproduction at https://github.com/Atry/trigger-inline-macro-from-compiler-plugin

git clone git@github.com:Atry/trigger-inline-macro-from-compiler-plugin.git && cd trigger-inline-macro-from-compiler-plugin && sbt test

Error log

Cloning into 'trigger-inline-macro-from-compiler-plugin'...
remote: Enumerating objects: 24, done.
remote: Counting objects: 100% (24/24), done.
remote: Compressing objects: 100% (16/16), done.
remote: Total 24 (delta 0), reused 21 (delta 0), pack-reused 0
Receiving objects: 100% (24/24), done.
[info] Loading global plugins from /Users/twer/.sbt/1.0/plugins/project
[info] Loading settings for project global-plugins from idea.sbt,mavenResolvers.sbt,metals.sbt ...
[info] Loading global plugins from /Users/twer/.sbt/1.0/plugins
[info] Loading settings for project trigger-inline-macro-from-compiler-plugin-build from local.sbt,plugins.sbt ...
[info] Loading project definition from /private/tmp/trigger-inline-macro-from-compiler-plugin/project
[info] Updating ProjectRef(uri("file:/private/tmp/trigger-inline-macro-from-compiler-plugin/project/"), "trigger-inline-macro-from-compiler-plugin-build")...
[info] Done updating.
[info] Loading settings for project trigger-inline-macro-from-compiler-plugin from build.sbt ...
[info] Set current project to trigger-inline-macro-from-compiler-plugin (in build file:/private/tmp/trigger-inline-macro-from-compiler-plugin/)
[info] Updating ...
[info] Done updating.
[info] Compiling 2 Scala sources to /private/tmp/trigger-inline-macro-from-compiler-plugin/target/scala-0.18/classes ...
[info] Done compiling.
[info] Packaging /private/tmp/trigger-inline-macro-from-compiler-plugin/target/scala-0.18/trigger-inline-macro-from-compiler-plugin_0.18-0.1.0-SNAPSHOT.jar ...
[info] Done packaging.
[info] Compiling 1 Scala source to /private/tmp/trigger-inline-macro-from-compiler-plugin/target/scala-0.18/test-classes ...
java.lang.AssertionError: assertion failed: unexpected top splice outside quote while compiling /private/tmp/trigger-inline-macro-from-compiler-plugin/src/test/scala/mypackage/Main.scala
[info] exception occurred while compiling /private/tmp/trigger-inline-macro-from-compiler-plugin/src/test/scala/mypackage/Main.scala
[error] ## Exception when compiling 1 sources to /private/tmp/trigger-inline-macro-from-compiler-plugin/target/scala-0.18/test-classes
[error] assertion failed: unexpected top splice outside quote
[error] dotty.DottyPredef$.assertFail(DottyPredef.scala:16)
[error] dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transformSplice(ReifyQuotes.scala:268)
[error] dotty.tools.dotc.transform.TreeMapWithStages.transform(TreeMapWithStages.scala:99)
[error] dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transform(ReifyQuotes.scala:419)
[error] dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transform(ReifyQuotes.scala:394)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1298)
[error] dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:117)
[error] dotty.tools.dotc.transform.TreeMapWithStages.mapOverTree$1(TreeMapWithStages.scala:76)
[error] dotty.tools.dotc.transform.TreeMapWithStages.transform(TreeMapWithStages.scala:126)
[error] dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transform(ReifyQuotes.scala:419)
[error] dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:97)
[error] dotty.tools.dotc.transform.TreeMapWithStages.mapOverTree$1(TreeMapWithStages.scala:76)
[error] dotty.tools.dotc.transform.TreeMapWithStages.transform(TreeMapWithStages.scala:126)
[error] dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transform(ReifyQuotes.scala:419)
[error] dotty.tools.dotc.ast.TreeMapWithImplicits.traverse$1(TreeMapWithImplicits.scala:51)
[error] dotty.tools.dotc.ast.TreeMapWithImplicits.transformStats(TreeMapWithImplicits.scala:58)
[error] dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:108)
[error] dotty.tools.dotc.transform.TreeMapWithStages.mapOverTree$1(TreeMapWithStages.scala:76)
[error] dotty.tools.dotc.transform.TreeMapWithStages.transform(TreeMapWithStages.scala:126)
[error] dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transform(ReifyQuotes.scala:419)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1334)
[error] dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:101)
[error] dotty.tools.dotc.transform.TreeMapWithStages.mapOverTree$1(TreeMapWithStages.scala:76)
[error] dotty.tools.dotc.transform.TreeMapWithStages.transform(TreeMapWithStages.scala:126)
[error] dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transform(ReifyQuotes.scala:419)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform$$anonfun$2(Trees.scala:1354)
[error] scala.collection.immutable.List.mapConserve(List.scala:451)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1354)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeMap.transformStats(Trees.scala:1352)
[error] dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1340)
[error] dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:101)
[error] dotty.tools.dotc.transform.TreeMapWithStages.mapOverTree$1(TreeMapWithStages.scala:76)
[error] dotty.tools.dotc.transform.TreeMapWithStages.transform(TreeMapWithStages.scala:126)
[error] dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transform(ReifyQuotes.scala:419)
[error] dotty.tools.dotc.transform.ReifyQuotes$$anon$1.transform(ReifyQuotes.scala:94)
[error] dotty.tools.dotc.transform.MacroTransform.run(MacroTransform.scala:21)
[error] dotty.tools.dotc.transform.ReifyQuotes.run(ReifyQuotes.scala:89)
[error] dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:315)
[error] scala.collection.immutable.List.map(List.scala:222)
[error] dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:316)
[error] dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:159)
[error] dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1350)
[error] dotty.tools.dotc.Run.runPhases$5(Run.scala:169)
[error] dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:177)
[error] dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
[error] dotty.tools.dotc.Run.compileUnits(Run.scala:184)
[error] dotty.tools.dotc.Run.compileSources(Run.scala:121)
[error] dotty.tools.dotc.Run.compile(Run.scala:104)
[error] dotty.tools.dotc.Driver.doCompile(Driver.scala:35)
[error] dotty.tools.dotc.Driver.process(Driver.scala:179)
[error] dotty.tools.dotc.Main.process(Main.scala)
[error] xsbt.CachedCompilerImpl.run(CachedCompilerImpl.java:69)
[error] xsbt.CompilerInterface.run(CompilerInterface.java:41)
[error] sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[error] sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[error] sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error] java.lang.reflect.Method.invoke(Method.java:498)
[error] sbt.internal.inc.AnalyzingCompiler.call(AnalyzingCompiler.scala:237)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:111)
[error] sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:90)
[error] sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3(MixedAnalyzingCompiler.scala:82)
[error] scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:133)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:73)
[error] sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:116)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:307)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:307)
[error] sbt.internal.inc.Incremental$.doCompile(Incremental.scala:106)
[error] sbt.internal.inc.Incremental$.$anonfun$compile$4(Incremental.scala:87)
[error] sbt.internal.inc.IncrementalCommon.recompileClasses(IncrementalCommon.scala:116)
[error] sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:63)
[error] sbt.internal.inc.Incremental$.$anonfun$compile$3(Incremental.scala:89)
[error] sbt.internal.inc.Incremental$.manageClassfiles(Incremental.scala:134)
[error] sbt.internal.inc.Incremental$.compile(Incremental.scala:80)
[error] sbt.internal.inc.IncrementalCompile$.apply(Compile.scala:67)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:311)
[error] sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:269)
[error] sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:159)
[error] sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:238)
[error] sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:69)
[error] sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:1549)
[error] sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:1523)
[error] scala.Function1.$anonfun$compose$1(Function1.scala:44)
[error] sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:40)
[error] sbt.std.Transform$$anon$4.work(System.scala:67)
[error] sbt.Execute.$anonfun$submit$2(Execute.scala:269)
[error] sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:16)
[error] sbt.Execute.work(Execute.scala:278)
[error] sbt.Execute.$anonfun$submit$1(Execute.scala:269)
[error] sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
[error] sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
[error] java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error] java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[error] java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error] java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[error] java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[error] java.lang.Thread.run(Thread.java:748)
[error]            
[error] java.lang.AssertionError: assertion failed: unexpected top splice outside quote
[error] 	at dotty.DottyPredef$.assertFail(DottyPredef.scala:16)
[error] 	at dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transformSplice(ReifyQuotes.scala:268)
[error] 	at dotty.tools.dotc.transform.TreeMapWithStages.transform(TreeMapWithStages.scala:99)
[error] 	at dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transform(ReifyQuotes.scala:419)
[error] 	at dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transform(ReifyQuotes.scala:394)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1298)
[error] 	at dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:117)
[error] 	at dotty.tools.dotc.transform.TreeMapWithStages.mapOverTree$1(TreeMapWithStages.scala:76)
[error] 	at dotty.tools.dotc.transform.TreeMapWithStages.transform(TreeMapWithStages.scala:126)
[error] 	at dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transform(ReifyQuotes.scala:419)
[error] 	at dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:97)
[error] 	at dotty.tools.dotc.transform.TreeMapWithStages.mapOverTree$1(TreeMapWithStages.scala:76)
[error] 	at dotty.tools.dotc.transform.TreeMapWithStages.transform(TreeMapWithStages.scala:126)
[error] 	at dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transform(ReifyQuotes.scala:419)
[error] 	at dotty.tools.dotc.ast.TreeMapWithImplicits.traverse$1(TreeMapWithImplicits.scala:51)
[error] 	at dotty.tools.dotc.ast.TreeMapWithImplicits.transformStats(TreeMapWithImplicits.scala:58)
[error] 	at dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:108)
[error] 	at dotty.tools.dotc.transform.TreeMapWithStages.mapOverTree$1(TreeMapWithStages.scala:76)
[error] 	at dotty.tools.dotc.transform.TreeMapWithStages.transform(TreeMapWithStages.scala:126)
[error] 	at dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transform(ReifyQuotes.scala:419)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1334)
[error] 	at dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:101)
[error] 	at dotty.tools.dotc.transform.TreeMapWithStages.mapOverTree$1(TreeMapWithStages.scala:76)
[error] 	at dotty.tools.dotc.transform.TreeMapWithStages.transform(TreeMapWithStages.scala:126)
[error] 	at dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transform(ReifyQuotes.scala:419)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform$$anonfun$2(Trees.scala:1354)
[error] 	at scala.collection.immutable.List.mapConserve(List.scala:451)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1354)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transformStats(Trees.scala:1352)
[error] 	at dotty.tools.dotc.ast.Trees$Instance$TreeMap.transform(Trees.scala:1340)
[error] 	at dotty.tools.dotc.ast.TreeMapWithImplicits.transform(TreeMapWithImplicits.scala:101)
[error] 	at dotty.tools.dotc.transform.TreeMapWithStages.mapOverTree$1(TreeMapWithStages.scala:76)
[error] 	at dotty.tools.dotc.transform.TreeMapWithStages.transform(TreeMapWithStages.scala:126)
[error] 	at dotty.tools.dotc.transform.ReifyQuotes$QuoteReifier.transform(ReifyQuotes.scala:419)
[error] 	at dotty.tools.dotc.transform.ReifyQuotes$$anon$1.transform(ReifyQuotes.scala:94)
[error] 	at dotty.tools.dotc.transform.MacroTransform.run(MacroTransform.scala:21)
[error] 	at dotty.tools.dotc.transform.ReifyQuotes.run(ReifyQuotes.scala:89)
[error] 	at dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:315)
[error] 	at scala.collection.immutable.List.map(List.scala:222)
[error] 	at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:316)
[error] 	at dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:159)
[error] 	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[error] 	at dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[error] 	at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1350)
[error] 	at dotty.tools.dotc.Run.runPhases$5(Run.scala:169)
[error] 	at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:177)
[error] 	at dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] 	at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:67)
[error] 	at dotty.tools.dotc.Run.compileUnits(Run.scala:184)
[error] 	at dotty.tools.dotc.Run.compileSources(Run.scala:121)
[error] 	at dotty.tools.dotc.Run.compile(Run.scala:104)
[error] 	at dotty.tools.dotc.Driver.doCompile(Driver.scala:35)
[error] 	at dotty.tools.dotc.Driver.process(Driver.scala:179)
[error] 	at dotty.tools.dotc.Main.process(Main.scala)
[error] 	at xsbt.CachedCompilerImpl.run(CachedCompilerImpl.java:69)
[error] 	at xsbt.CompilerInterface.run(CompilerInterface.java:41)
[error] 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[error] 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[error] 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error] 	at java.lang.reflect.Method.invoke(Method.java:498)
[error] 	at sbt.internal.inc.AnalyzingCompiler.call(AnalyzingCompiler.scala:237)
[error] 	at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:111)
[error] 	at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:90)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$3(MixedAnalyzingCompiler.scala:82)
[error] 	at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:133)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:73)
[error] 	at sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:116)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:307)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:307)
[error] 	at sbt.internal.inc.Incremental$.doCompile(Incremental.scala:106)
[error] 	at sbt.internal.inc.Incremental$.$anonfun$compile$4(Incremental.scala:87)
[error] 	at sbt.internal.inc.IncrementalCommon.recompileClasses(IncrementalCommon.scala:116)
[error] 	at sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:63)
[error] 	at sbt.internal.inc.Incremental$.$anonfun$compile$3(Incremental.scala:89)
[error] 	at sbt.internal.inc.Incremental$.manageClassfiles(Incremental.scala:134)
[error] 	at sbt.internal.inc.Incremental$.compile(Incremental.scala:80)
[error] 	at sbt.internal.inc.IncrementalCompile$.apply(Compile.scala:67)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:311)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:269)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:159)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:238)
[error] 	at sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:69)
[error] 	at sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:1549)
[error] 	at sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:1523)
[error] 	at scala.Function1.$anonfun$compose$1(Function1.scala:44)
[error] 	at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:40)
[error] 	at sbt.std.Transform$$anon$4.work(System.scala:67)
[error] 	at sbt.Execute.$anonfun$submit$2(Execute.scala:269)
[error] 	at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:16)
[error] 	at sbt.Execute.work(Execute.scala:278)
[error] 	at sbt.Execute.$anonfun$submit$1(Execute.scala:269)
[error] 	at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
[error] 	at sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
[error] 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error] 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[error] 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[error] 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[error] 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[error] 	at java.lang.Thread.run(Thread.java:748)
[error] (Test / compileIncremental) java.lang.AssertionError: assertion failed: unexpected top splice outside quote
[error] Total time: 5 s, completed 2019-9-2 23:45:38

[nicolasstucki]

This is partly by design. Macro expansion occurs in Typer to be able to refine types of whitebox inlines. While plugins can only execute after Typer to only transform well-typed trees. Your case seems to just use the combination of typing interaction we are trying to avoid.

We have discussed the possibility of expanding blackbox macros after Typer (possibly between Pickler and ReifyQuotes). This might help to support this kind of use cases. We could also imagine expanding whitebox macros at the same time (if inserted by plugins) but treat them as blackbox. The plugin could in such a case add explicitly some casts to recover some precise type of expanded expression, though this would be fragile.

[Atry]

Even blackbox macros are definitely helpful. Unfortunately it still crashes when I switch to blackbox macros: Atry/trigger-inline-macro-from-compiler-plugin@109595b

Error log: https://travis-ci.org/Atry/trigger-inline-macro-from-compiler-plugin/builds/581069366

[nicolasstucki]

Yes. To support them we would need to do a major change in the internal logic of the compiler.