Tests for literal denominations with non-integer literals

test/libsolidity/semanticTests/literals/fractional_denominations.sol

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+contract C {
+    uint public g = 1.5 gwei;
+    uint public e = 1.5 ether;
+    uint public m = 1.5 minutes;
+    uint public h = 1.5 hours;
+    uint public d = 1.5 days;
+    uint public w = 1.5 weeks;
+}
+// ----
+// g() -> 1500000000
+// e() -> 1500000000000000000
+// m() -> 90
+// h() -> 5400
+// d() -> 129600
+// w() -> 907200

test/libsolidity/syntaxTests/denominations/invalid_denomination_address.sol

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+contract C {
+	address a = 0x11111122222333334444455555666667777788888 wei;
+}
+// ----
+// TypeError 5145: (26-73): Hexadecimal numbers cannot be used with unit denominations. You can use an expression of the form "0x1234 * 1 day" instead.

test/libsolidity/syntaxTests/denominations/invalid_denomination_on_bool.sol

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+contract C {
+	bool constant x = true ether;
+}
+// ----
+// ParserError 2314: (37-42): Expected ';' but got 'ether'

test/libsolidity/syntaxTests/denominations/invalid_denomination_on_string.sol

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+contract C {
+	string s = "abc" ether;
+}
+// ----
+// ParserError 2314: (31-36): Expected ';' but got 'ether'