---input---
⟨alias⇐a, b⟩ ← {
  b‿c⇐
  a⇐2
  c←÷b↩1+a
}

---tokens---
'⟨'           Punctuation
'alias'       Name.Variable
'⇐'           Keyword.Declaration
'a'           Name.Variable
','           Punctuation
' '           Text.Whitespace
'b'           Name.Variable
'⟩'           Punctuation
' '           Text.Whitespace
'←'           Keyword.Declaration
' '           Text.Whitespace
'{'           Keyword.Type
'\n  '        Text.Whitespace
'b'           Name.Variable
'‿'           Punctuation
'c'           Name.Variable
'⇐'           Keyword.Declaration
'\n  '        Text.Whitespace
'a'           Name.Variable
'⇐'           Keyword.Declaration
'2'           Literal.Number
'\n  '        Text.Whitespace
'c'           Name.Variable
'←'           Keyword.Declaration
'÷'           Operator
'b'           Name.Variable
'↩'           Keyword.Declaration
'1'           Literal.Number
'+'           Operator
'a'           Name.Variable
'\n'          Text.Whitespace

'}'           Keyword.Type
'\n'          Text.Whitespace