Allow "if (try foo())"."

test/test_suite/errors/try_expr.c3t

@@ -0,0 +1,49 @@
+// #target: macos-x64
+module foo;
+import std::io;
+
+fn void main()
+{
+	int a;
+	if (try foo())
+	{
+		a--;
+	}
+	else
+	{
+		a++;
+	}
+}
+
+fn void! foo() {}
+
+/* #expect: foo.ll
+
+define void @foo.main() #0 {
+entry:
+  %a = alloca i32, align 4
+  store i32 0, ptr %a, align 4
+  %0 = call i64 @foo.foo()
+  %not_err = icmp eq i64 %0, 0
+  %1 = call i1 @llvm.expect.i1(i1 %not_err, i1 true)
+  br i1 %1, label %after_check, label %catch_landing
+after_check:                                      ; preds = %entry
+  br label %phi_try_catch
+catch_landing:                                    ; preds = %entry
+  br label %phi_try_catch
+phi_try_catch:                                    ; preds = %catch_landing, %after_check
+  %val = phi i1 [ true, %after_check ], [ false, %catch_landing ]
+  br i1 %val, label %if.then, label %if.else
+if.then:                                          ; preds = %phi_try_catch
+  %2 = load i32, ptr %a, align 4
+  %sub = sub i32 %2, 1
+  store i32 %sub, ptr %a, align 4
+  br label %if.exit
+if.else:                                          ; preds = %phi_try_catch
+  %3 = load i32, ptr %a, align 4
+  %add = add i32 %3, 1
+  store i32 %add, ptr %a, align 4
+  br label %if.exit
+if.exit:                                          ; preds = %if.else, %if.then
+  ret void
+}