diagnose various conversion problems

R=ken
OCL=17320
CL=17320

1 files changed, 35 insertions, 0 deletions

diff --git a/test/convlit.go b/test/convlit.go
new file mode 100644
index 0000000000..b6f3134c6b
--- /dev/null
+++ b/test/convlit.go
@@ -0,0 +1,35 @@
+// errchk $G -e $D/$F.go
+
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+// explicit conversions are okay, even if they overflow
+var x1 = string(1);
+var x2 string = string(1);
+var x3 = int(1.5);
+var x4 int = int(1.5);
+var x5 = "a" + string(1);
+var x6 = int(1e100);
+var x7 = float(1e1000);
+
+// implicit conversions merit scrutiny
+var s string;
+var bad1 string = 1;	// ERROR "conver"
+var bad2 = s + 1;		// ERROR "conver"
+var bad3 = s + 'a';	// ERROR "conver"
+var bad4 = "a" + 1;	// ERROR "literals"
+var bad5 = "a" + 'a';	// ERROR "literals"
+
+var bad6 int = 1.5;	// ERROR "convert"
+var bad7 int = 1e100;	// ERROR "overflow"
+var bad8 float = 1e1000;	// ERROR "overflow"
+
+// but these implicit conversions are okay
+var good1 string = "a";
+var good2 int = 1.0;
+var good3 int = 1e9;
+var good4 float = 1e20;
+