Problems reported:

parser/error_recovery/issue_38415.crash:1:15: Expected '[' before this.
f() { m(T<R(<Z
              ^...

parser/error_recovery/issue_38415.crash:1:15: Expected ';' after this.
f() { m(T<R(<Z
              ^...

beginCompilationUnit(f)
  beginMetadataStar(f)
  endMetadataStar(0)
  beginTopLevelMember(f)
    beginTopLevelMethod(UnmatchedToken({), null)
      handleNoType(UnmatchedToken({))
      handleIdentifier(f, topLevelFunctionDeclaration)
      handleNoTypeVariables(()
      beginFormalParameters((, MemberKind.TopLevelMethod)
      endFormalParameters(0, (, ), MemberKind.TopLevelMethod)
      handleAsyncModifier(null, null)
      beginBlockFunctionBody({)
        handleIdentifier(m, expression)
        handleNoTypeArguments(()
        beginArguments(()
          handleIdentifier(T, expression)
          handleNoTypeArguments(<)
          handleNoArguments(<)
          handleSend(T, <)
          beginBinaryExpression(<)
          handleIdentifier(R, expression)
          handleNoTypeArguments(()
          beginArguments(()
            beginTypeArguments(<)
              handleIdentifier(Z, typeReference)
              handleNoTypeArguments())
              handleType(Z, null)
            endTypeArguments(1, <, >)
            handleRecoverableError(Message[ExpectedButGot, Expected '[' before this., null, {string: [}], , )
            handleLiteralList(0, [, null, ])
          endArguments(1, (, ))
          handleSend(R, })
          endBinaryExpression(<)
        endArguments(1, (, ))
        handleSend(m, })
        handleRecoverableError(Message[ExpectedAfterButGot, Expected ';' after this., null, {string: ;}], , )
        handleExpressionStatement(;)
      endBlockFunctionBody(1, {, })
    endTopLevelMethod(f, null, })
  endTopLevelDeclaration()
  handleErrorToken(UnmatchedToken(())
  handleErrorToken(UnmatchedToken(<))
  handleErrorToken(UnmatchedToken(())
  handleErrorToken(UnmatchedToken({))
endCompilationUnit(1, )