Concatenation not working in flutter, instead, variable breaks into two lines? - flutter

Question

So, this is a very small problem, but totally annoying!
This is my code:
print('COORDINATES -> ${lat}:${lng}');
As you can see, it should print out, example: '74.23132:47.13123' right?
But instead it goes like this..
flutter: COORDINATES -> 74.23132:
47.13123
Is it really suppose to work like that in flutter?
Best regards!
flutter doctor -v
[✓] Flutter (Channel stable, v1.7.8+hotfix.3, on Mac OS X 10.14.5 18F203, locale en-GB)
• Flutter version 1.7.8+hotfix.3 at /Users/usr/Developer/flutter
• Framework revision b712a172f9 (9 days ago), 2019-07-09 13:14:38 -0700
• Engine revision 54ad777fd2
• Dart version 2.4.0
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
• Android SDK at /Users/usr/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.3
• Java binary at: /Applications/Android Studio 3.5 Preview.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 10.2.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 10.2.1, Build version 10E1001
• CocoaPods version 1.7.0
[✓] iOS tools - develop for iOS devices
• ios-deploy 1.9.4
[✓] Android Studio (version 3.5)
• Android Studio at /Applications/Android Studio 3.5 Preview.app/Contents
• Flutter plugin version 37.1.3
• Dart plugin version 191.7830
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
[✓] Connected device (2 available)
• Mattias’s iPhone • aaf4a41bc5a93fcf273e2070e19ec2a6a3f37921 • ios • iOS 12.3.1
• iPhone Xʀ • 93F3E348-5835-492B-B756-CCD1BAD6C8E8 • ios • com.apple.CoreSimulator.SimRuntime.iOS-12-2 (simulator)
• No issues found!

Answer 1

SOLUTION
After trying every logic step to accomplish this, it turns out that the flutter-team hasn't supported this yet! So don't even get into this ever, until flutter support two variables in concatenating. Very very sad to let you know!