"Inapplicable operator modifier" and "Inapplicable infix modifier" are now errors

idea/testData/intentions/toInfixCall/multipleArguments.kt

@@ -1,5 +1,5 @@
 // IS_APPLICABLE: false
-// WARNING: 'infix' modifier is inapplicable on this function
+// ERROR: 'infix' modifier is inapplicable on this function
 interface Foo {
     infix fun foo(a: Int, b: Int)
 }

idea/testData/intentions/toInfixCall/namedArgument.kt

@@ -1,4 +1,5 @@
 // IS_APPLICABLE: false
+// ERROR: 'infix' modifier is inapplicable on this function
 fun foo(x: Foo) {
     x.<caret>foo(bar = x)
 }

idea/testData/intentions/toInfixCall/packageFunctionCall.kt

@@ -1,5 +1,5 @@
 // IS_APPLICABLE: false
-// WARNING: 'infix' modifier is inapplicable on this function
+// ERROR: 'infix' modifier is inapplicable on this function
 package ppp
 
 infix fun foo(p: String){}

idea/testData/intentions/toInfixCall/secondParameterLabeled.kt

@@ -1,4 +1,6 @@
 // IS_APPLICABLE: false
+// ERROR: 'infix' modifier is inapplicable on this function
+
 class Foo {
     infix fun foo(x: Int = 0, y: Int = 0) {
     }

idea/testData/intentions/toInfixCall/simpleArgumentAndFunctionLiteralArgument.kt

@@ -1,5 +1,5 @@
 // IS_APPLICABLE: false
-// WARNING: 'infix' modifier is inapplicable on this function
+// ERROR: 'infix' modifier is inapplicable on this function
 
 fun foo(x: Foo) {
     x.<caret>foo(1) { it * 2 }

idea/testData/intentions/toInfixCall/singlePackageFunctionCall.kt

@@ -1,6 +1,6 @@
 // WITH_RUNTIME
 // IS_APPLICABLE: false
-// WARNING: 'infix' modifier is inapplicable on this function
+// ERROR: 'infix' modifier is inapplicable on this function
 
 package demo