Fabric: Kotlin compiler can't find FabricBlockSettings class from fabric-object-builder-api-v1

[ignirtoq]

Summary

When adding the line

import net.fabricmc.fabric.api.object.builder.v1.block.FabricBlockSettings

to a fresh clone the example Fabric Kotlin mod (here), the following errors are seen:

e: C:\[...]\MinimalImportError\src\main\kotlin\net\fabricmc\example\ExampleMod.kt: (3, 32): Qualified name must be a '.'-separated identifier list
e: C:\[...]\MinimalImportError\src\main\kotlin\net\fabricmc\example\ExampleMod.kt: (3, 39): Unresolved reference: builder

Steps to Reproduce

1. Download a fresh clone of the Kotlin example mod: https://github.com/natanfudge/fabric-example-mod-kotlin
2. Update the gradle.properties file with the latest Fabric versions provided from here: https://modmuss50.me/fabric.html. My case is copied below:

kotlin.code.style=official
org.gradle.jvmargs=-Xmx1G

# Fabric Properties
    # Check these on https://modmuss50.me/fabric.html
    minecraft_version=1.16.4
    yarn_mappings=1.16.4+build.7
    loader_version=0.10.8

    #Fabric api
    fabric_version=0.28.1+1.16

    loom_version=0.5-SNAPSHOT

    # Mod Properties
    mod_version = 1.0.0
    maven_group = net.minimalproblem
    archives_base_name = minimal-import-error-mod

# Kotlin
    kotlin_version=1.4.0
    fabric_kotlin_version=1.4.0+build.1

1. Prepare the development environment as outlined here: https://fabricmc.net/wiki/tutorial:setup. In my case I started with VS Code, then blew away the entire project folder and tried again with IntelliJ, yielding the same results.
2. Update the src/main/kotlin/net/fabricmc/example/ExampleMod.kt file and add the following as line 3:

import net.fabricmc.fabric.api.object.builder.v1.block.FabricBlockSettings

1. Run either the runClient or compileKotlin Gradle task (the compile task is a dependency of the run task, so either will fail in the same place).

Environment

• Java 8 Update 221 (for Minecraft)
• AdoptOpenJDK 11.0.9.11 (for VS Code Java extensions)

[Juuxel]

This isn't really a bug. object is a keyword in Kotlin, so it needs to be escaped with backticks:

import net.fabricmc.fabric.api.`object`.builder.v1.block.FabricBlockSettings

IDEA should do this automatically for you as well.

[i509VCB]

Juuz's solution there is the right way to work around that.

[ignirtoq]

Thank you. I could not for the life of me figure out the problem nor find a solution. I did not know about backticks. I will look up more information about this syntax.