Merge pull request #4684 from ethereum/underscores_in_numeric_literals

[BREAKING] Underscores in numeric literals

test/libsolidity/syntaxTests/parsing/lexer_numbers_with_underscores_decimal.sol

@@ -0,0 +1,13 @@
+contract C {
+  function f() public pure {
+    uint d1 = 654_321;
+    uint d2 =  54_321;
+    uint d3 =   4_321;
+    uint d4 = 5_43_21;
+    uint d5 = 1_2e10;
+    uint d6 = 12e1_0;
+
+    d1; d2; d3; d4; d5; d6;
+  }
+}
+// ----

test/libsolidity/syntaxTests/parsing/lexer_numbers_with_underscores_decimal_fail.sol

@@ -0,0 +1,13 @@
+contract C {
+  function f() public pure {
+    uint D1 = 1234_;
+    uint D2 = 12__34;
+    uint D3 = 12_e34;
+    uint D4 = 12e_34;
+  }
+}
+// ----
+// SyntaxError: (56-61): Invalid use of underscores in number literal. No trailing underscores allowed.
+// SyntaxError: (77-83): Invalid use of underscores in number literal. Only one consecutive underscores between digits allowed.
+// SyntaxError: (99-105): Invalid use of underscores in number literal. No underscore at the end of the mantissa allowed.
+// SyntaxError: (121-127): Invalid use of underscores in number literal. No underscore in front of exponent allowed.

test/libsolidity/syntaxTests/parsing/lexer_numbers_with_underscores_fixed.sol

@@ -0,0 +1,9 @@
+contract C {
+  function f() public pure {
+    fixed f1 = 3.14_15;
+    fixed f2 = 3_1.4_15;
+
+    f1; f2;
+  }
+}
+// ----

test/libsolidity/syntaxTests/parsing/lexer_numbers_with_underscores_fixed_fail.sol

@@ -0,0 +1,17 @@
+contract C {
+  function f() public pure {
+    fixed F1 = 3.1415_;
+    fixed F2 = 3__1.4__15;
+    fixed F3 = 1_.2;
+    fixed F4 = 1._2;
+    fixed F5 = 1.2e_12;
+    fixed F6 = 1._;
+  }
+}
+// ----
+// SyntaxError: (57-64): Invalid use of underscores in number literal. No trailing underscores allowed.
+// SyntaxError: (81-91): Invalid use of underscores in number literal. Only one consecutive underscores between digits allowed.
+// SyntaxError: (108-112): Invalid use of underscores in number literal. No underscores in front of the fraction part allowed.
+// SyntaxError: (129-133): Invalid use of underscores in number literal. No underscores in front of the fraction part allowed.
+// SyntaxError: (150-157): Invalid use of underscores in number literal. No underscore in front of exponent allowed.
+// SyntaxError: (174-177): Invalid use of underscores in number literal. No trailing underscores allowed.

test/libsolidity/syntaxTests/parsing/lexer_numbers_with_underscores_hex.sol

@@ -0,0 +1,13 @@
+contract C {
+  function f() public pure {
+    uint x1 = 0x8765_4321;
+    uint x2 = 0x765_4321;
+    uint x3 = 0x65_4321;
+    uint x4 = 0x5_4321;
+    uint x5 = 0x123_1234_1234_1234;
+    uint x6 = 0x123456_1234_1234;
+
+    x1; x2; x3; x4; x5; x6;
+  }
+}
+// ----

test/libsolidity/syntaxTests/parsing/lexer_numbers_with_underscores_hex_fail.sol

@@ -0,0 +1,7 @@
+contract C {
+  function f() public pure {
+    uint X1 = 0x1234__1234__1234__123;
+  }
+}
+// ----
+// SyntaxError: (56-79): Invalid use of underscores in number literal. Only one consecutive underscores between digits allowed.