const is not recognised as keyword

[HaSa1002]

Version: 0.7-dev (Last Build 2020-09-13 01:30)

Description of the problem:
const is not recognised as keyword
Steps to reproduce:
See below
Code:

Source Code

const MAX_15B = 1 << 15
const MAX_16B = 1 << 16

func unsigned16_to_signed(unsigned):
    return (unsigned   MAX_15B) % MAX_16B - MAX_15B

func _ready():
    var f = File.new()
    f.open(user://file.dat, File.WRITE_READ)
    f.store_16(-42) # This wraps around and stores 65494 (2^16 - 42).
    f.store_16(121) # In bounds, will store 121.
    f.seek(0) # Go back to start to read the stored value.
    var read1 = f.get_16() # 65494
    var read2 = f.get_16() # 121
    var converted1 = unsigned16_to_signed(read1) # -42
    var converted2 = unsigned16_to_signed(read2) # 121

Output

[codeblocks]
[gdscript]
const MAX_15B = 1 << 15
const MAX_16B = 1 << 16

func unsigned16_to_signed(unsigned):
    return (unsigned   MAX_15B) % MAX_16B - MAX_15B

func _ready():
    var f = File.new()
    f.open(user://file.dat, File.WRITE_READ)
    f.store_16(-42) # This wraps around and stores 65494 (2^16 - 42).
    f.store_16(121) # In bounds, will store 121.
    f.seek(0) # Go back to start to read the stored value.
    var read1 = f.get_16() # 65494
    var read2 = f.get_16() # 121
    var converted1 = unsigned16_to_signed(read1) # -42
    var converted2 = unsigned16_to_signed(read2) # 121
[/gdscript]
[csharp]
Const Max15b = 1 <  < 15;
Const Max16b = 1 <  < 16;

public void Unsigned16ToSigned(?TYPE? unsigned)
{
    return (unsigned   MAX_15B)% MAX_16B - MAX_15B;
}

public override void _Ready()
{
    var f = new File();
    f.Open(user://file.dat, File.WRITE_READ);
    f.Store16() - 42); // This wraps around and stores 65494 (2^16 - 42).
    f.Store16(121); // In bounds, will store 121.
    f.Seek(0); // Go back to start to read the stored value.
    ?VAR? read1 = f.Get16(); // 65494
    ?VAR? read2 = f.Get16(); // 121
    ?VAR? converted1 = Unsigned16ToSigned(read1); // -42
    ?VAR? converted2 = Unsigned16ToSigned(read2); // 121
}
[/csharp]
[/codeblocks]

Expected Output

Warnings

[4] No return value provided. Assuming void. Use -> RETVAL to specify
[4] No type provided. Consider type hinting with NAME:TYPE
[5] If constant is enum refer to documentation for correct syntax.
[5] If constant is enum refer to documentation for correct syntax.
[5] If constant is enum refer to documentation for correct syntax.
[7] No return value provided. Assuming void. Use -> RETVAL to specify
[9] If constant is enum refer to documentation for correct syntax.
[10] If constant is enum refer to documentation for correct syntax.
[13] Type of declaration is unknown
[14] Type of declaration is unknown
[15] Type of declaration is unknown
[16] Type of declaration is unknown