Wrong generated method sequence point ranges

[auduchinok]

There is a significant issue in hwTokenFetch generation, which makes it very hard, or almost impossible, to debug this function.

fsharp/src/Compiler/SyntaxTree/LexFilter.fs

Line 1217 in c4ad09a

let rec hwTokenFetch useBlockRule =

According to the pdb information, the last sequence point in this method has range at this when condition:

fsharp/src/Compiler/SyntaxTree/LexFilter.fs

Line 1985 in c4ad09a

| (VAL | STATIC | ABSTRACT | MEMBER | OVERRIDE | DEFAULT), ctxtStack when thereIsACtxtMemberBodyOnTheStackAndWeShouldPopStackForUpcomingMember ctxtStack ->

Here's a dump of sequence points read from the pdb, look for 100718728 metadata token.

Stepping any further in this method is impossible because the debugger can't match subsequent sequence points to the method. Neither Visual Studio, nor Rider can debug this method properly.