Update grammar

Author: fvictorio

antlr

@@ -93,42 +93,44 @@ T__91=92
 T__92=93
 T__93=94
 T__94=95
-Int=96
-Uint=97
-Byte=98
-Fixed=99
-Ufixed=100
-BooleanLiteral=101
-DecimalNumber=102
-HexNumber=103
-NumberUnit=104
-HexLiteralFragment=105
-ReservedKeyword=106
-AnonymousKeyword=107
-BreakKeyword=108
-ConstantKeyword=109
-ImmutableKeyword=110
-ContinueKeyword=111
-LeaveKeyword=112
-ExternalKeyword=113
-IndexedKeyword=114
-InternalKeyword=115
-PayableKeyword=116
-PrivateKeyword=117
-PublicKeyword=118
-VirtualKeyword=119
-PureKeyword=120
-TypeKeyword=121
-ViewKeyword=122
-ConstructorKeyword=123
-FallbackKeyword=124
-ReceiveKeyword=125
-Identifier=126
-StringLiteralFragment=127
-VersionLiteral=128
-WS=129
-COMMENT=130
-LINE_COMMENT=131
+T__95=96
+T__96=97
+Int=98
+Uint=99
+Byte=100
+Fixed=101
+Ufixed=102
+BooleanLiteral=103
+DecimalNumber=104
+HexNumber=105
+NumberUnit=106
+HexLiteralFragment=107
+ReservedKeyword=108
+AnonymousKeyword=109
+BreakKeyword=110
+ConstantKeyword=111
+ImmutableKeyword=112
+ContinueKeyword=113
+LeaveKeyword=114
+ExternalKeyword=115
+IndexedKeyword=116
+InternalKeyword=117
+PayableKeyword=118
+PrivateKeyword=119
+PublicKeyword=120
+VirtualKeyword=121
+PureKeyword=122
+TypeKeyword=123
+ViewKeyword=124
+ConstructorKeyword=125
+FallbackKeyword=126
+ReceiveKeyword=127
+Identifier=128
+StringLiteralFragment=129
+VersionLiteral=130
+WS=131
+COMMENT=132
+LINE_COMMENT=133
 'pragma'=1
 ';'=2
 '||'=3
@@ -153,93 +155,95 @@ LINE_COMMENT=131
 'is'=22
 '('=23
 ')'=24
-'using'=25
-'for'=26
-'struct'=27
-'modifier'=28
-'function'=29
-'returns'=30
-'event'=31
-'enum'=32
-'['=33
-']'=34
-'address'=35
-'.'=36
-'mapping'=37
-'=>'=38
-'memory'=39
-'storage'=40
-'calldata'=41
-'if'=42
-'else'=43
-'try'=44
-'catch'=45
-'while'=46
-'unchecked'=47
-'assembly'=48
-'do'=49
-'return'=50
-'throw'=51
-'emit'=52
-'var'=53
-'bool'=54
-'string'=55
-'byte'=56
-'++'=57
-'--'=58
-'new'=59
-':'=60
-'+'=61
-'-'=62
-'after'=63
-'delete'=64
-'!'=65
-'**'=66
-'/'=67
-'%'=68
-'<<'=69
-'>>'=70
-'&'=71
-'|'=72
-'=='=73
-'!='=74
-'&&'=75
-'?'=76
-'|='=77
-'^='=78
-'&='=79
-'<<='=80
-'>>='=81
-'+='=82
-'-='=83
-'*='=84
-'/='=85
-'%='=86
-'let'=87
-':='=88
-'=:'=89
-'switch'=90
-'case'=91
-'default'=92
-'->'=93
-'callback'=94
-'override'=95
-'anonymous'=107
-'break'=108
-'constant'=109
-'immutable'=110
-'continue'=111
-'leave'=112
-'external'=113
-'indexed'=114
-'internal'=115
-'payable'=116
-'private'=117
-'public'=118
-'virtual'=119
-'pure'=120
-'type'=121
-'view'=122
-'constructor'=123
-'fallback'=124
-'receive'=125
+'error'=25
+'using'=26
+'for'=27
+'struct'=28
+'modifier'=29
+'function'=30
+'returns'=31
+'event'=32
+'enum'=33
+'['=34
+']'=35
+'address'=36
+'.'=37
+'mapping'=38
+'=>'=39
+'memory'=40
+'storage'=41
+'calldata'=42
+'if'=43
+'else'=44
+'try'=45
+'catch'=46
+'while'=47
+'unchecked'=48
+'assembly'=49
+'do'=50
+'return'=51
+'throw'=52
+'emit'=53
+'revert'=54
+'var'=55
+'bool'=56
+'string'=57
+'byte'=58
+'++'=59
+'--'=60
+'new'=61
+':'=62
+'+'=63
+'-'=64
+'after'=65
+'delete'=66
+'!'=67
+'**'=68
+'/'=69
+'%'=70
+'<<'=71
+'>>'=72
+'&'=73
+'|'=74
+'=='=75
+'!='=76
+'&&'=77
+'?'=78
+'|='=79
+'^='=80
+'&='=81
+'<<='=82
+'>>='=83
+'+='=84
+'-='=85
+'*='=86
+'/='=87
+'%='=88
+'let'=89
+':='=90
+'=:'=91
+'switch'=92
+'case'=93
+'default'=94
+'->'=95
+'callback'=96
+'override'=97
+'anonymous'=109
+'break'=110
+'constant'=111
+'immutable'=112
+'continue'=113
+'leave'=114
+'external'=115
+'indexed'=116
+'internal'=117
+'payable'=118
+'private'=119
+'public'=120
+'virtual'=121
+'pure'=122
+'type'=123
+'view'=124
+'constructor'=125
+'fallback'=126
+'receive'=127