compiler: c'str' now has type charptr

vlib/compiler/expression.v

@@ -167,10 +167,15 @@ fn (p mut Parser) name_expr() string {
 	}
 
 	// Raw string (`s := r'hello \n ')
-	if (name == 'r' || name == 'c') && p.peek() == .str && p.prev_tok != .str_dollar {
+	if name == 'r' && p.peek() == .str && p.prev_tok != .str_dollar {
 		p.string_expr()
 		return 'string'
 	}
+	// C string (a zero terminated one) C.func( c'hello' )
+	if name == 'c' && p.peek() == .str && p.prev_tok != .str_dollar {
+		p.string_expr()
+		return 'charptr'
+	}
 	// known_type := p.table.known_type(name)
 	orig_name := name
 	is_c := name == 'C' && p.peek() == .dot

vlib/compiler/tests/cstrings_test.v

@@ -0,0 +1,9 @@
+
+fn C.puts(charptr) int
+
+fn test_cstring(){
+  h := c'world'
+  C.puts(c'hello')
+  C.puts(h)
+  assert true
+}