Syntax error in if() in catch in lambda completely breaks brace matching

[SLaks]

Source:

using System;

class C {
    C() {
        try {
            Action a = () => {
                try {
                    try {
                    } catch (ArgumentException ex) {
                        if (1 2)
                            ex.ParamName.ToString();
                    }
                } catch (AggregateException ex) { }
            };
        } catch (Exception ex) { }
    }
}

(all three catch blocks are required to reproduce the bug)

The invalid if causes brace matching to drop out of sync; the } following the ToString() matches the outermost try {, and the remaining catch blocks become class & namespace-level scoping.

This breaks brace highlighting and Ctrl+}, and gives very strange semantic errors (ex.ParamName fails because the field AggregateException ex has no such member).

[dpoeschl]

Error recovery leaves the if statement as just the if (1 2 part, and the local declaration of a as Action a = () => { ... if (1 2. The ) ex.ParamName.ToString(); is reinterpreted as a top-level ExpressionStatement, etc.