Deprecate use of unary '+'

The unary '+' serves no meaningful purpose in Solidity and it makes it
possible to produce typos with dagerous implications (e.g. 'a =+5 '),
so we are deprecating it.  The SyntaxChecker currently issues warnings
on the unary '+' but will still compile it for now.

1 files changed, 10 insertions, 1 deletions

diff --git a/test/libsolidity/SolidityNameAndTypeResolution.cpp b/test/libsolidity/SolidityNameAndTypeResolution.cpp
index f88f600a..8e80e006 100644
--- a/test/libsolidity/SolidityNameAndTypeResolution.cpp
+++ b/test/libsolidity/SolidityNameAndTypeResolution.cpp
@@ -3938,12 +3938,21 @@ BOOST_AUTO_TEST_CASE(rational_unary_operation)
 	char const* text = R"(
 		contract test {
 			function f() {
-				ufixed8x16 a = +3.25;
+				ufixed8x16 a = 3.25;
 				fixed8x16 b = -3.25;
 			}
 		}
 	)";
 	CHECK_SUCCESS(text);
+	text = R"(
+		contract test {
+			function f() {
+				ufixed8x16 a = +3.25;
+				fixed8x16 b = -3.25;
+			}
+		}
+	)";
+	CHECK_WARNING(text,"Use of unary + is deprecated");
 }
 
 BOOST_AUTO_TEST_CASE(leading_zero_rationals_convert)